dnl 
dnl Autoconf configuration file for APR
dnl 
dnl Process this file with autoconf to produce a configure script.
dnl Use ./buildconf to prepare build files and run autoconf for APR.

AC_PREREQ(2.59)

AC_INIT(build/apr_common.m4)
AC_CONFIG_HEADER(include/arch/unix/apr_private.h)
AC_CONFIG_AUX_DIR(build)
AC_CONFIG_MACRO_DIR(build)

dnl 
dnl Include our own M4 macros along with those for libtool
dnl 
sinclude(build/apr_common.m4)
sinclude(build/apr_network.m4)
sinclude(build/apr_threads.m4)
sinclude(build/apr_win32.m4)
sinclude(build/apr_hints.m4)
sinclude(build/libtool.m4)
sinclude(build/ltsugar.m4)
sinclude(build/argz.m4)
sinclude(build/ltoptions.m4)
sinclude(build/ltversion.m4)
sinclude(build/lt~obsolete.m4)

sinclude(build/apu-conf.m4)
sinclude(build/xml.m4)
sinclude(build/apu-hints.m4)
sinclude(build/crypto.m4)
sinclude(build/dbm.m4)
sinclude(build/dbd.m4)
sinclude(build/dso.m4)
sinclude(build/iconv.m4)

dnl Hard-coded top of apr_private.h:
AH_TOP([
#ifndef APR_PRIVATE_H
#define APR_PRIVATE_H

/* Pick up publicly advertised headers and symbols before the
 * APR internal private headers and symbols
 */
#include <apr.h>
])

dnl Hard-coded inclusion at the tail end of apr_private.h:
AH_BOTTOM([
/* switch this on if we have a BeOS version below BONE */
#if defined(BEOS) && !defined(HAVE_BONE_VERSION)
#define BEOS_R5 1
#else
#define BEOS_BONE 1
#endif

/*
 * Darwin 10's default compiler (gcc42) builds for both 64 and
 * 32 bit architectures unless specifically told not to.
 * In those cases, we need to override types depending on how
 * we're being built at compile time.
 * NOTE: This is an ugly work-around for Darwin's
 * concept of universal binaries, a single package
 * (executable, lib, etc...) which contains both 32
 * and 64 bit versions. The issue is that if APR is
 * built universally, if something else is compiled
 * against it, some bit sizes will depend on whether
 * it is 32 or 64 bit. This is determined by the __LP64__
 * flag. Since we need to support both, we have to
 * handle OS X unqiuely.
 */
#ifdef DARWIN_10

#undef APR_OFF_T_STRFN
#undef APR_INT64_STRFN
#undef SIZEOF_LONG
#undef SIZEOF_SIZE_T
#undef SIZEOF_SSIZE_T
#undef SIZEOF_VOIDP
#undef SIZEOF_STRUCT_IOVEC

#ifdef __LP64__
 #define APR_INT64_STRFN strtol
 #define SIZEOF_LONG    8
 #define SIZEOF_SIZE_T  8
 #define SIZEOF_SSIZE_T 8
 #define SIZEOF_VOIDP   8
 #define SIZEOF_STRUCT_IOVEC 16
#else
 #define APR_INT64_STRFN strtoll
 #define SIZEOF_LONG    4
 #define SIZEOF_SIZE_T  4
 #define SIZEOF_SSIZE_T 4
 #define SIZEOF_VOIDP   4
 #define SIZEOF_STRUCT_IOVEC 8
#endif

#undef APR_OFF_T_STRFN
#define APR_OFF_T_STRFN APR_INT64_STRFN
 

#undef SETPGRP_VOID
#ifdef __DARWIN_UNIX03
 #define SETPGRP_VOID 1
#else
/* #undef SETPGRP_VOID */
#endif
 
#endif /* DARWIN_10 */

#endif /* APR_PRIVATE_H */
])

dnl Save user-defined environment settings for later restoration
dnl
APR_SAVE_THE_ENVIRONMENT(CPPFLAGS)
APR_SAVE_THE_ENVIRONMENT(CFLAGS)
APR_SAVE_THE_ENVIRONMENT(LDFLAGS)
APR_SAVE_THE_ENVIRONMENT(LIBS)
APR_SAVE_THE_ENVIRONMENT(INCLUDES)

dnl Generate ./config.nice for reproducing runs of configure
dnl
APR_CONFIG_NICE(config.nice)

AC_CANONICAL_SYSTEM
AC_MSG_NOTICE([Configuring APR library])
AC_MSG_NOTICE([Platform: $host])

dnl Some initial steps for configuration.  We setup the default directory
dnl and which files are to be configured.

dnl Setup the directory macros now

# Absolute source/build directory
apr_srcdir=`(cd $srcdir && pwd)`
apr_builddir=`pwd`
AC_SUBST(apr_srcdir)
AC_SUBST(apr_builddir)

if test "$apr_builddir" != "$apr_srcdir"; then
  USE_VPATH=1
  APR_CONFIG_LOCATION=build
else
  APR_CONFIG_LOCATION=source
fi

AC_SUBST(APR_CONFIG_LOCATION)

# Libtool might need this symbol -- it must point to the location of
# the generated libtool script (not necessarily the "top" build dir).
#
top_builddir="$apr_builddir"
AC_SUBST(top_builddir)

# Directory containing apr build macros, helpers, and make rules
# NOTE: make rules (apr_rules.mk) will be in the builddir for vpath
#
apr_buildout=$apr_builddir/build
apr_builders=$apr_srcdir/build
AC_SUBST(apr_builders)

MKDIR=$apr_builders/mkdir.sh

dnl Initialize mkdir -p functionality.
APR_MKDIR_P_CHECK($apr_builders/mkdir.sh)

# get our version information
get_version="$apr_builders/get-version.sh"
version_hdr="$apr_srcdir/include/apr_version.h"
APR_MAJOR_VERSION="`$get_version major $version_hdr APR`"
APR_DOTTED_VERSION="`$get_version all $version_hdr APR`"

AC_SUBST(APR_DOTTED_VERSION)
AC_SUBST(APR_MAJOR_VERSION)

AC_MSG_NOTICE([APR Version: ${APR_DOTTED_VERSION}])

dnl Enable the layout handling code, then reparse the prefix-style
dnl arguments due to autoconf being a PITA.
APR_ENABLE_LAYOUT(apr)
dnl This must be synchronized to the prefix of the apr layout, to make
dnl configure --help print the correct default.
AC_PREFIX_DEFAULT([/usr/local/apr])
APR_PARSE_ARGUMENTS

dnl Set optional CC hints here in case autoconf makes an inappropriate choice.
dnl This allows us to suggest what the compiler should be, but still
dnl allows the user to override CC externally.
APR_CC_HINTS

dnl Do the various CC checks *before* preloading values. The preload code
dnl may need to use compiler characteristics to make decisions. This macro
dnl can only be used once within a configure script, so this prevents a
dnl preload section from invoking the macro to get compiler info.
AC_PROG_CC

dnl AC_PROG_SED is only avaliable in recent autoconf versions.
dnl Use AC_CHECK_PROG instead if AC_PROG_SED is not present.
ifdef([AC_PROG_SED],
      [AC_PROG_SED],
      [AC_CHECK_PROG(SED, sed, sed)])

dnl Preload
APR_PRELOAD

dnl These added to allow default directories to be used...
DEFAULT_OSDIR="unix"
AC_MSG_NOTICE([(Default will be ${DEFAULT_OSDIR})])

apr_modules="file_io network_io threadproc misc locks time mmap shmem user memory atomic poll support random"

dnl Checks for programs.
AC_PROG_MAKE_SET
AC_PROG_CPP
AC_PROG_AWK
AC_PROG_LN_S
AC_PROG_RANLIB
AC_PROG_INSTALL
AC_CHECK_PROG(RM, rm, rm)
AC_CHECK_TOOL(AS, as, as)
AC_CHECK_TOOL(ASCPP, cpp, cpp)
AC_CHECK_TOOL(AR, ar, ar)

dnl Various OS checks that apparently set required flags
ifdef([AC_USE_SYSTEM_EXTENSIONS], [
AC_USE_SYSTEM_EXTENSIONS
], [
AC_AIX
AC_MINIX
])

AC_ISC_POSIX
APR_EBCDIC

dnl this is our library name
APR_LIBNAME="apr${libsuffix}"
AC_SUBST(APR_LIBNAME)

dnl prep libtool
dnl
AC_MSG_NOTICE([performing libtool configuration...])

AC_ARG_ENABLE(experimental-libtool,[  --enable-experimental-libtool Use experimental custom libtool],
  [experimental_libtool=$enableval],[experimental_libtool=no])

dnl Workarounds for busted Libtool 2.x when we don't call AC_PROG_LIBTOOL
if test "x$Xsed" = "x"; then
  Xsed="$SED -e 1s/^X//"
fi

case $host in
*-os2*)
    # Use a custom-made libtool replacement
    AC_MSG_NOTICE([using aplibtool])
    LIBTOOL="$apr_builddir/build/aplibtool"
    LIBTOOL_SRC="$apr_srcdir/build/aplibtool.c"
    $CC $CFLAGS $CPPFLAGS -o $LIBTOOL.exe $LIBTOOL_SRC
    ;;
*)
    if test "x$LTFLAGS" = "x"; then
        LTFLAGS='--silent'
    fi
    if test "$experimental_libtool" = "yes"; then
        # Use a custom-made libtool replacement
        AC_MSG_NOTICE([using jlibtool])
        LIBTOOL="$apr_builddir/libtool"
        LIBTOOL_SRC="$apr_srcdir/build/jlibtool.c"
        $CC $CFLAGS $CPPFLAGS -o $LIBTOOL $LIBTOOL_SRC
        eval `$apr_builddir/libtool --config | grep "^shlibpath_var=[[A-Z_]]*$"`
        if test "x$shlibpath_var" = "x"; then
            shlibpath_var=REPLACE_WITH_YOUR_SHLIBPATH_VAR
        fi
    else
    dnl libtoolize requires that the following not be indented
    dnl should become LT_INIT(win32-dll)
AC_LIBTOOL_WIN32_DLL
AC_PROG_LIBTOOL
        # get libtool's setting of shlibpath_var
        eval `grep "^shlibpath_var=[[A-Z_]]*$" $apr_builddir/libtool`
        if test "x$shlibpath_var" = "x"; then
            shlibpath_var=REPLACE_WITH_YOUR_SHLIBPATH_VAR
        fi
    fi
    ;;
esac

AC_ARG_WITH(installbuilddir, [  --with-installbuilddir=DIR location to store APR build files (defaults to '${datadir}/build')],
  [ installbuilddir=$withval ], [ installbuilddir="${datadir}/build-${APR_MAJOR_VERSION}" ] )
AC_SUBST(installbuilddir)

AC_ARG_WITH(libtool, [  --without-libtool       avoid using libtool to link the library],
  [ use_libtool=$withval ], [ use_libtool="yes" ] )

if test "x$use_libtool" = "xyes"; then
      lt_compile='$(LIBTOOL) $(LTFLAGS) --mode=compile $(COMPILE) -o $@ -c $< && touch $@'
      LT_VERSION="-version-info `$get_version libtool $version_hdr APR`"
      link="\$(LIBTOOL) \$(LTFLAGS) --mode=link \$(COMPILE) \$(LT_LDFLAGS) \$(LT_VERSION) \$(ALL_LDFLAGS) -o \$@"
      so_ext='lo'
      lib_target='-rpath $(libdir) $(OBJECTS)'
      export_lib_target='-rpath \$(libdir) \$(OBJECTS)'
else
      lt_compile='$(COMPILE) -o $@ -c $<'
      link='$(AR) cr $(TARGET_LIB) $(OBJECTS); $(RANLIB) $(TARGET_LIB)'
      so_ext='o'
      lib_target=''
      export_lib_target=''
fi

case $host in
    *-solaris2*)
        apr_platform_runtime_link_flag="-R"
        ;;
    *-mingw* | *-cygwin*)
        LT_LDFLAGS="$LT_LDFLAGS -no-undefined"
        ;;
    *)
        ;;
esac

AC_SUBST(lt_compile)
AC_SUBST(link)
AC_SUBST(so_ext)
AC_SUBST(lib_target)
AC_SUBST(export_lib_target)
AC_SUBST(shlibpath_var)
AC_SUBST(LTFLAGS)
AC_SUBST(LT_LDFLAGS)
AC_SUBST(LT_VERSION)

dnl ----------------------------- Checks for compiler flags
nl='
'
AC_MSG_NOTICE([])
AC_MSG_NOTICE([Check for compiler flags...])

dnl AC_PROG_CC sets -g in CFLAGS (and -O2 for gcc) by default.
dnl On OS/390 this causes the compiler to insert extra debugger
dnl hook instructions.  That's fine for debug/maintainer builds, not fine
dnl otherwise.

case $host in
    *os390)
        if test "$ac_test_CFLAGS" != set; then
           APR_REMOVEFROM(CFLAGS,-g)
        fi
        ;;
esac

AC_ARG_ENABLE(debug,[  --enable-debug          Turn on debugging and compile time warnings],
  [APR_ADDTO(CFLAGS,-g)
   if test "$GCC" = "yes"; then
     APR_ADDTO(CFLAGS,-Wall)
   elif test "$AIX_XLC" = "yes"; then
     APR_ADDTO(CFLAGS,-qfullpath)
   fi
])dnl

AC_ARG_ENABLE(maintainer-mode,[  --enable-maintainer-mode  Turn on debugging and compile time warnings],
  [APR_ADDTO(CFLAGS,-g)
   if test "$GCC" = "yes"; then
     APR_ADDTO(CFLAGS,[-Wall -Wmissing-prototypes -Wstrict-prototypes -Wmissing-declarations])
   elif test "$AIX_XLC" = "yes"; then
     APR_ADDTO(CFLAGS,-qfullpath -qinitauto=FE -qcheck=all -qinfo=pro)
   fi
])dnl

AC_ARG_ENABLE(profile,[  --enable-profile        Turn on profiling for the build (GCC)],
  if test "$GCC" = "yes"; then
    APR_ADDTO(CFLAGS, -pg)
    APR_REMOVEFROM(CFLAGS, -g)
    if test "$host" = "i586-pc-beos"; then
        APR_REMOVEFROM(CFLAGS, -O2)
        APR_ADDTO(CFLAGS, -O1)
        APR_ADDTO(LDFLAGS, -p)
    fi
  fi
)dnl

AC_ARG_ENABLE(pool-debug,
  [  --enable-pool-debug[[=yes|no|verbose|verbose-alloc|lifetime|owner|all]]    Turn on pools debugging],
  [ if test -z "$enableval"; then
        APR_ADDTO(CPPFLAGS, -DAPR_POOL_DEBUG=1)
    elif test ! "$enableval" = "no"; then
        apr_pool_debug=1
    
        for i in $enableval
        do
            flag=0
        
            case $i in
            yes)
                flag=1
                ;;
            verbose)
                flag=2
                ;;
            lifetime)
                flag=4
                ;;
            owner)
                flag=8
                ;;
            verbose-alloc)
                flag=16
                ;;
            all)
                apr_pool_debug=31
                ;;
            *)
                ;;
            esac

            if test $flag -gt 0; then
                apr_pool_debug=`expr '(' $apr_pool_debug - $apr_pool_debug % \
                    '(' $flag '*' 2 ')' ')' + $flag + $apr_pool_debug % $flag`
            fi
        done
      
        APR_ADDTO(CPPFLAGS, -DAPR_POOL_DEBUG=$apr_pool_debug)
    fi
  ])

if test "$host" = "i586-pc-beos"; then
  AC_ARG_ENABLE(malloc-debug,[  --enable-malloc-debug   Switch on malloc_debug for BeOS],
    APR_REMOVEFROM(CFLAGS, -O2)
    APR_ADDTO(CPPFLAGS, -fcheck-memory-usage -D_KERNEL_MODE)
  ) dnl
fi

# this is the place to put specific options for platform/compiler
# combinations
case "$host:$CC" in
    *-hp-hpux*:cc )
	APR_ADDTO(CFLAGS,[-Ae +Z])
	case $host in
	  ia64-* )
	    ;;
          * )
	    if echo "$CFLAGS " | grep '+DA' >/dev/null; then :
	    else
	      APR_ADDTO(CFLAGS,[+DAportable])
	    fi 
	    ;;
        esac
	;;
    powerpc-*-beos:mwcc* )
	APR_SETVAR(CPP,[mwcc -E])
	APR_SETVAR(CC,mwcc)
	APR_SETVAR(AR,ar)
	;;

    dnl If building static APR, both the APR build and the app build
    dnl need -DAPR_DECLARE_STATIC to generate the right linkage from    
    dnl APR_DECLARE et al.
    dnl If building dynamic APR, the APR build needs APR_DECLARE_EXPORT
    dnl and the app build should have neither define.
    *-mingw* | *-cygwin*)
        if test "$enable_shared" = "yes"; then
            APR_ADDTO(INTERNAL_CPPFLAGS, -DAPR_DECLARE_EXPORT)
        else
            APR_ADDTO(CPPFLAGS, -DAPR_DECLARE_STATIC)
        fi
        ;;
esac

AC_CACHE_CHECK([whether the compiler provides atomic builtins], [ap_cv_atomic_builtins],
[AC_TRY_RUN([
int main()
{
    unsigned long val = 1010, tmp, *mem = &val;

    if (__sync_fetch_and_add(&val, 1010) != 1010 || val != 2020)
        return 1;

    tmp = val;

    if (__sync_fetch_and_sub(mem, 1010) != tmp || val != 1010)
        return 1;

    if (__sync_sub_and_fetch(&val, 1010) != 0 || val != 0)
        return 1;

    tmp = 3030;

    if (__sync_val_compare_and_swap(mem, 0, tmp) != 0 || val != tmp)
        return 1;

    if (__sync_lock_test_and_set(&val, 4040) != 3030)
        return 1;

    mem = &tmp;

    if (__sync_val_compare_and_swap(&mem, &tmp, &val) != &tmp)
        return 1;

    __sync_synchronize();

    if (mem != &val)
        return 1;

    return 0;
}], [ap_cv_atomic_builtins=yes], [ap_cv_atomic_builtins=no], [ap_cv_atomic_builtins=no])])

if test "$ap_cv_atomic_builtins" = "yes"; then
    AC_DEFINE(HAVE_ATOMIC_BUILTINS, 1, [Define if compiler provides atomic builtins])
fi

case $host in
    powerpc-405-*)
        # The IBM ppc405cr processor has a bugged stwcx instruction.
        AC_DEFINE(PPC405_ERRATA, 1, [Define on PowerPC 405 where errata 77 applies])
        ;;
    *)
        ;;
esac

dnl Check the depend program we can use
APR_CHECK_DEPEND

proc_mutex_is_global=0

config_subdirs="none"
INSTALL_SUBDIRS="none"
OBJECTS_PLATFORM='$(OBJECTS_unix)'

case $host in
   i386-ibm-aix* | *-ibm-aix[[1-2]].* | *-ibm-aix3.* | *-ibm-aix4.1 | *-ibm-aix4.1.* | *-ibm-aix4.2 | *-ibm-aix4.2.*)
       OSDIR="aix"
       APR_ADDTO(LDFLAGS,-lld)
       eolstr="\\n"
       OBJECTS_PLATFORM='$(OBJECTS_aix)'
       ;;
   *-os2*)
       APR_ADDTO(CPPFLAGS,-DOS2)
       APR_ADDTO(CFLAGS,-Zmt)
       AC_CHECK_LIB(bsd, random)
       OSDIR="os2"
       enable_threads="system_threads"
       eolstr="\\r\\n"
       file_as_socket="0"
       proc_mutex_is_global=1
       OBJECTS_PLATFORM='$(OBJECTS_os2)'
       ;;
   *beos*)
       OSDIR="beos"
       APR_ADDTO(CPPFLAGS,-DBEOS)
       enable_threads="system_threads"
       native_mmap_emul="1"
       APR_CHECK_DEFINE(BONE_VERSION, sys/socket.h)
       eolstr="\\n"
       osver=`uname -r`
       proc_mutex_is_global=1
       OBJECTS_PLATFORM='$(OBJECTS_beos)'
       case $osver in
          5.0.4)
             file_as_socket="1"
             ;;
          *)
             file_as_socket="0"
             ;;
       esac
       ;;
   *os390)
       OSDIR="os390"
       OBJECTS_PLATFORM='$(OBJECTS_os390)'
       eolstr="\\n"
       ;;
   *os400)
       OSDIR="as400"
       eolstr="\\n"
       ;;
   *mingw*)
       OSDIR="win32"
       enable_threads="system_threads"
       eolstr="\\r\\n"
       file_as_socket=0
       proc_mutex_is_global=1
       OBJECTS_PLATFORM='$(OBJECTS_win32)'
       ;;
   *cygwin*)
       OSDIR="unix"
       enable_threads="no"
       eolstr="\\n"
       ;;
   *hpux10* ) 
       enable_threads="no"
       OSDIR="unix"
       eolstr="\\n"
       ;;
   *)
       OSDIR="unix"
       eolstr="\\n"
       ;;
esac

AC_SUBST(OBJECTS_PLATFORM)

# Check whether LFS has explicitly been disabled
AC_ARG_ENABLE(lfs,[  --disable-lfs           Disable large file support on 32-bit platforms],
[apr_lfs_choice=$enableval], [apr_lfs_choice=yes])

if test "$apr_lfs_choice" = "yes"; then
   # Check whether the transitional LFS API is sufficient
   AC_CACHE_CHECK([whether to enable -D_LARGEFILE64_SOURCE], [apr_cv_use_lfs64], [
   apr_save_CPPFLAGS=$CPPFLAGS
   CPPFLAGS="$CPPFLAGS -D_LARGEFILE64_SOURCE"
   AC_TRY_RUN([
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

void main(void)
{
    int fd, ret = 0;
    struct stat64 st;
    off64_t off = 4242;

    if (sizeof(off64_t) != 8 || sizeof(off_t) != 4)
       exit(1);
    if ((fd = open("conftest.lfs", O_LARGEFILE|O_CREAT|O_WRONLY, 0644)) < 0)
       exit(2);
    if (ftruncate64(fd, off) != 0)
       ret = 3;
    else if (fstat64(fd, &st) != 0 || st.st_size != off)
       ret = 4;
    else if (lseek64(fd, off, SEEK_SET) != off)
       ret = 5;
    else if (close(fd) != 0)
       ret = 6;
    else if (lstat64("conftest.lfs", &st) != 0 || st.st_size != off)
       ret = 7;
    else if (stat64("conftest.lfs", &st) != 0 || st.st_size != off)
       ret = 8;
    unlink("conftest.lfs");

    exit(ret);
}], [apr_cv_use_lfs64=yes], [apr_cv_use_lfs64=no], [apr_cv_use_lfs64=no])
   CPPFLAGS=$apr_save_CPPFLAGS])
   if test "$apr_cv_use_lfs64" = "yes"; then
      APR_ADDTO(CPPFLAGS, [-D_LARGEFILE64_SOURCE])
   fi
fi

AC_ARG_ENABLE(nonportable-atomics,
[  --enable-nonportable-atomics  Use optimized atomic code which may produce nonportable binaries],
[if test $enableval = yes; then
   force_generic_atomics=no
 else
   force_generic_atomics=yes
 fi
],
[case $host_cpu in
   i[[456]]86) force_generic_atomics=yes ;;
   *) force_generic_atomics=no
      case $host in
         *solaris2.10*)
            AC_TRY_COMPILE(
                [#include <atomic.h>],
                [void *ptr = NULL; atomic_cas_ptr(&ptr, NULL, NULL);],,
                [force_generic_atomics=yes]
            )
            if test $force_generic_atomics = yes; then
                AC_MSG_NOTICE([nonportable atomic support disabled, system needs Patch-ID 118884 or 118885])
            fi
            ;;
      esac
      ;;
esac
])

if test $force_generic_atomics = yes; then
   AC_DEFINE([USE_ATOMICS_GENERIC], 1,
             [Define if use of generic atomics is requested])
fi

AC_SUBST(proc_mutex_is_global)
AC_SUBST(eolstr)
AC_SUBST(INSTALL_SUBDIRS)

# For some platforms we need a version string which allows easy numeric
# comparisons.
case $host in
    *freebsd*)
        if test -x /sbin/sysctl; then
            os_version=`/sbin/sysctl -n kern.osreldate`
        else
            os_version=000000
        fi
        ;;
    *linux*)
        os_major=[`uname -r | sed -e 's/\([1-9][0-9]*\)\..*/\1/'`]
        os_minor=[`uname -r | sed -e 's/[1-9][0-9]*\.\([0-9]\+\)\..*/\1/'`]
        if test $os_major -lt 2 -o \( $os_major -eq 2 -a $os_minor -lt 4 \); then
            AC_MSG_WARN([Configured for pre-2.4 Linux $os_major.$os_minor])
            os_pre24linux=1
        else
            os_pre24linux=0
            AC_MSG_NOTICE([Configured for Linux $os_major.$os_minor])
        fi
        ;;
    *os390)
        os_version=`uname -r | sed -e 's/\.//g'`
        ;;
    *)
        os_version=OS_VERSION_IS_NOT_SET
        ;;
esac

AC_MSG_NOTICE([])
AC_MSG_NOTICE([Checking for libraries...])

dnl ----------------------------- Checks for Any required Libraries
dnl Note: Autoconf will always append LIBS with an extra " " in AC_CHECK_LIB.
dnl It should check for LIBS being empty and set LIBS equal to the new value 
dnl without the extra " " in that case, but they didn't do that.  So, we
dnl end up LIBS="-lm -lcrypt -lnsl  -ldl" which is an annoyance.
case $host in
   *-mingw*)
      APR_ADDTO(LIBS,[-lshell32 -ladvapi32 -lws2_32 -lrpcrt4 -lmswsock])
      ac_cv_func_CreateFileMapping=yes
      ;;
   *)
      AC_SEARCH_LIBS(gethostbyname, nsl)
      AC_SEARCH_LIBS(gethostname, nsl)
      AC_SEARCH_LIBS(socket, socket)
      AC_SEARCH_LIBS(crypt, crypt ufc)
      AC_CHECK_LIB(truerand, main)
      AC_SEARCH_LIBS(modf, m)
       ;;
esac

dnl ----------------------------- Checking for Threads
AC_MSG_NOTICE([${nl}Checking for Threads...])

if test -z "$enable_threads"; then
	AC_ARG_ENABLE(threads,
	[  --enable-threads        Enable threading support in APR.],
	[ enable_threads=$enableval] ,
	[ APR_CHECK_PTHREADS_H([ enable_threads="pthread" ] ,
	                       [ enable_threads="no" ] ) ] )
fi

if test "$enable_threads" = "no"; then
    threads="0"
    pthreadh="0"
    pthreadser="0"
else
    if test "$enable_threads" = "pthread"; then
# We have specified pthreads for our threading library, just make sure
# that we have everything we need
      APR_PTHREADS_CHECK_SAVE
      APR_PTHREADS_CHECK
      APR_CHECK_PTHREADS_H([
          threads="1"
          pthreadh="1"
          pthreadser="1" ], [
          threads="0"
          pthreadh="0"
          pthreadser="0"
          APR_PTHREADS_CHECK_RESTORE ] )
    elif test "$enable_threads" = "system_threads"; then
        threads="1"
        pthreadh="0"
        pthreadser="0"
    else
# We basically specified that we wanted threads, but not how to implement
# them.  In this case, just look for pthreads.  In the future, we can check
# for other threading libraries as well.
      APR_PTHREADS_CHECK_SAVE
      APR_PTHREADS_CHECK
      APR_CHECK_PTHREADS_H([
          threads="1"
          pthreadh="1"
          pthreadser="1" ], [
          threads="0"
          pthreadser="0"
          pthreadh="0"
          APR_PTHREADS_CHECK_RESTORE ] )
    fi
    if test "$pthreadh" = "1"; then
        APR_CHECK_PTHREAD_GETSPECIFIC_TWO_ARGS
        APR_CHECK_PTHREAD_ATTR_GETDETACHSTATE_ONE_ARG
        APR_CHECK_PTHREAD_RECURSIVE_MUTEX
        AC_CHECK_FUNCS([pthread_key_delete pthread_rwlock_init \
                        pthread_attr_setguardsize pthread_yield])

        if test "$ac_cv_func_pthread_rwlock_init" = "yes"; then
            dnl ----------------------------- Checking for pthread_rwlock_t
            AC_CACHE_CHECK([for pthread_rwlock_t], [apr_cv_type_rwlock_t],
            AC_TRY_COMPILE([#include <sys/types.h>
#include <pthread.h>], [pthread_rwlock_t *rwlock;],
              [apr_cv_type_rwlock_t=yes], [apr_cv_type_rwlock_t=no], 
              [apr_cv_type_rwlock_t=no]))
            if test "$apr_cv_type_rwlock_t" = "yes"; then
               AC_DEFINE(HAVE_PTHREAD_RWLOCKS, 1, [Define if pthread rwlocks are available])
            fi
        fi

        if test "$ac_cv_func_pthread_yield" = "no"; then
            dnl ----------------------------- Checking for sched_yield
            AC_CHECK_HEADERS([sched.h])
            AC_CHECK_FUNCS([sched_yield])
        fi
    fi
fi

ac_cv_define_READDIR_IS_THREAD_SAFE=no
ac_cv_define_GETHOSTBYNAME_IS_THREAD_SAFE=no
ac_cv_define_GETHOSTBYADDR_IS_THREAD_SAFE=no
ac_cv_define_GETSERVBYNAME_IS_THREAD_SAFE=no
if test "$threads" = "1"; then
    AC_MSG_NOTICE([APR will use threads])
    AC_CHECK_LIB(c_r, readdir,
        AC_DEFINE(READDIR_IS_THREAD_SAFE, 1, 
                  [Define if readdir is thread safe]))
    if test "x$apr_gethostbyname_is_thread_safe" = "x"; then
        AC_CHECK_LIB(c_r, gethostbyname, apr_gethostbyname_is_thread_safe=yes)
    fi
    if test "$apr_gethostbyname_is_thread_safe" = "yes"; then
        AC_DEFINE(GETHOSTBYNAME_IS_THREAD_SAFE, 1,
                  [Define if gethostbyname is thread safe])
    fi
    if test "x$apr_gethostbyaddr_is_thread_safe" = "x"; then
        AC_CHECK_LIB(c_r, gethostbyaddr, apr_gethostbyaddr_is_thread_safe=yes)
    fi
    if test "$apr_gethostbyaddr_is_thread_safe" = "yes"; then
        AC_DEFINE(GETHOSTBYADDR_IS_THREAD_SAFE, 1, 
                  [Define if gethostbyaddr is thread safe])
    fi
    if test "x$apr_getservbyname_is_thread_safe" = "x"; then
        AC_CHECK_LIB(c_r, getservbyname, apr_getservbyname_is_thread_safe=yes)
    fi
    if test "$apr_getservbyname_is_thread_safe" = "yes"; then
        AC_DEFINE(GETSERVBYNAME_IS_THREAD_SAFE, 1, 
                  [Define if getservbyname is thread safe])
    fi
    AC_CHECK_FUNCS(gethostbyname_r gethostbyaddr_r getservbyname_r)
else
    AC_MSG_NOTICE([APR will be non-threaded])
fi

dnl Electric Fence malloc checker.
dnl --with-efence specifies the path to Electric Fence.
dnl This test should remain after the threads checks since libefence
dnl may depend on libpthread.
AC_ARG_WITH(efence, 
  [  --with-efence[[=DIR]]     path to Electric Fence installation], 
  [ apr_efence_dir="$withval"
    if test "$apr_efence_dir" != "yes"; then
      APR_ADDTO(LDFLAGS,[-L$apr_efence_dir/lib])
      if test "x$apr_platform_runtime_link_flag" != "x"; then
          APR_ADDTO(LDFLAGS, 
                    [$apr_platform_runtime_link_flag$apr_efence_dir/lib])
      fi
    fi
    AC_CHECK_LIB(efence, malloc, 
                 [ APR_ADDTO(LIBS,-lefence) ],
                 [ AC_MSG_ERROR(Electric Fence requested but not detected) ])
  ])

AC_ARG_WITH(valgrind,
  [  --with-valgrind[[=DIR]]   Enable code to teach valgrind about apr pools
                          (optionally: set path to valgrind headers) ],
  [ if test "$withval" != no; then
      if test "$withval" = yes; then
        withval=/usr/include/valgrind
      fi
      APR_ADDTO(CPPFLAGS, -I$withval)
      AC_CHECK_HEADERS(valgrind.h memcheck.h)
      APR_IFALLYES(header:valgrind.h header:memcheck.h,
        [AC_DEFINE(HAVE_VALGRIND, 1, [Compile in valgrind support]) ],
        [AC_MSG_ERROR(valgrind headers not found) ]
      )
    fi ]
)

AC_CHECK_FUNCS(sigsuspend, [ have_sigsuspend="1" ], [ have_sigsuspend="0" ])
AC_CHECK_FUNCS(sigwait, [ have_sigwait="1" ], [ have_sigwait="0" ]) 
dnl AC_CHECK_FUNCS doesn't work for this on Tru64 since the function
dnl is renamed in signal.h.  Todo: Autodetect
case $host in
    *alpha*-dec-osf* )
        have_sigwait="1"
        ;;
esac

AC_SUBST(threads)
AC_SUBST(have_sigsuspend)
AC_SUBST(have_sigwait)

AC_CHECK_FUNCS(poll kqueue port_create)

# Check for the Linux epoll interface; epoll* may be available in libc
# but return ENOSYS on a pre-2.6 kernel, so do a run-time check.
AC_CACHE_CHECK([for epoll support], [apr_cv_epoll],
[AC_TRY_RUN([
#include <sys/epoll.h>
#include <unistd.h>

int main()
{
    return epoll_create(5) == -1;
}], [apr_cv_epoll=yes], [apr_cv_epoll=no], [apr_cv_epoll=no])])

if test "$apr_cv_epoll" = "yes"; then
   AC_DEFINE([HAVE_EPOLL], 1, [Define if the epoll interface is supported])
fi

dnl ----------------------------- Checking for extended file descriptor handling
# test for epoll_create1
AC_CACHE_CHECK([for epoll_create1 support], [apr_cv_epoll_create1],
[AC_TRY_RUN([
#include <sys/epoll.h>
#include <unistd.h>

int main()
{
    return epoll_create1(0) == -1;
}], [apr_cv_epoll_create1=yes], [apr_cv_epoll_create1=no], [apr_cv_epoll_create1=no])])

if test "$apr_cv_epoll_create1" = "yes"; then
   AC_DEFINE([HAVE_EPOLL_CREATE1], 1, [Define if epoll_create1 function is supported])
fi

# Check for z/OS async i/o support.  
AC_CACHE_CHECK([for asio -> message queue support], [apr_cv_aio_msgq],
[AC_TRY_RUN([
#define _AIO_OS390
#include <aio.h>

int main()
{
    struct aiocb a;

    a.aio_notifytype = AIO_MSGQ;  /* use IPC message queue for notification */

    return aio_cancel(2, NULL) == -1;
}], [apr_cv_aio_msgq=yes], [apr_cv_aio_msgq=no], [apr_cv_aio_msgq=no])])

if test "$apr_cv_aio_msgq" = "yes"; then
   AC_DEFINE([HAVE_AIO_MSGQ], 1, [Define if async i/o supports message q's])
fi

# test for dup3
AC_CACHE_CHECK([for dup3 support], [apr_cv_dup3],
[AC_TRY_RUN([
#include <unistd.h>

int main()
{
    return dup3(STDOUT_FILENO, STDERR_FILENO, 0) == -1;
}], [apr_cv_dup3=yes], [apr_cv_dup3=no], [apr_cv_dup3=no])])

if test "$apr_cv_dup3" = "yes"; then
   AC_DEFINE([HAVE_DUP3], 1, [Define if dup3 function is supported])
fi

# Test for accept4().  Create a non-blocking socket, bind it to
# an unspecified port & address (kernel picks), and attempt to
# call accept4() on it.  If the syscall is wired up (i.e. the
# kernel is new enough), it should return EAGAIN.
AC_CACHE_CHECK([for accept4 support], [apr_cv_accept4],
[AC_TRY_RUN([
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

int main(int argc, char **argv)
{
    int fd, flags;
    struct sockaddr_in sin;

    if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
        return 1;
    flags = fcntl(fd, F_GETFL);
    if (flags == -1 || fcntl(fd, F_SETFL, flags|O_NONBLOCK) == -1)
        return 5;

    memset(&sin, 0, sizeof sin);
    sin.sin_family = AF_INET;
    
    if (bind(fd, (struct sockaddr *) &sin, sizeof sin) == -1)
        return 2;
    
    if (listen(fd, 5) == -1)
        return 3;

    if (accept4(fd, NULL, 0, SOCK_NONBLOCK) == 0
        || errno == EAGAIN || errno == EWOULDBLOCK)
        return 0;

    return 4;
}], [apr_cv_accept4=yes], [apr_cv_accept4=no], [apr_cv_accept4=no])])

if test "$apr_cv_accept4" = "yes"; then
   AC_DEFINE([HAVE_ACCEPT4], 1, [Define if accept4 function is supported])
fi

AC_CACHE_CHECK([for SOCK_CLOEXEC support], [apr_cv_sock_cloexec],
[AC_TRY_RUN([
#include <sys/types.h>
#include <sys/socket.h>

int main()
{
    return socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, 0) == -1;
}], [apr_cv_sock_cloexec=yes], [apr_cv_sock_cloexec=no], [apr_cv_sock_cloexec=no])])

if test "$apr_cv_sock_cloexec" = "yes"; then
   AC_DEFINE([HAVE_SOCK_CLOEXEC], 1, [Define if the SOCK_CLOEXEC flag is supported])
fi

dnl ----------------------------- Checking for fdatasync: OS X doesn't have it
AC_CHECK_FUNCS(fdatasync)

dnl ----------------------------- Checking for missing POSIX thread functions
AC_CHECK_FUNCS([getpwnam_r getpwuid_r getgrnam_r getgrgid_r])

dnl ----------------------------- Checking for Shared Memory Support 
AC_MSG_NOTICE([])
AC_MSG_NOTICE([Checking for Shared Memory Support...])

# The real-time POSIX extensions (e.g. shm_*, sem_*) may only
# be available if linking against librt.
AC_SEARCH_LIBS(shm_open, rt)

case $host in
 *-sysv*)
   ac_includes_default="$ac_includes_default
#if HAVE_SYS_MUTEX_H /* needed to define lock_t for sys/shm.h */
# include <sys/mutex.h>
#endif";;
esac

AC_CHECK_HEADERS([sys/types.h sys/mman.h sys/ipc.h sys/mutex.h sys/shm.h sys/file.h kernel/OS.h os2.h windows.h])
AC_CHECK_FUNCS([mmap munmap shm_open shm_unlink shmget shmat shmdt shmctl \
                create_area mprotect])

APR_CHECK_DEFINE(MAP_ANON, sys/mman.h)
AC_CHECK_FILE(/dev/zero)

# Not all systems can mmap /dev/zero (such as HP-UX).  Check for that.
if test "$ac_cv_func_mmap" = "yes" &&
   test "$ac_cv_file__dev_zero" = "yes"; then
    AC_MSG_CHECKING(for mmap that can map /dev/zero)
    AC_TRY_RUN([
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
    int main()
    {
        int fd;
        void *m;
        fd = open("/dev/zero", O_RDWR);
        if (fd < 0) {
            return 1;
        }
        m = mmap(0, sizeof(void*), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
        if (m == (void *)-1) {  /* aka MAP_FAILED */
            return 2;
        }
        if (munmap(m, sizeof(void*)) < 0) {
            return 3;
        }
        return 0;
    }], [], [ac_cv_file__dev_zero=no], [ac_cv_file__dev_zero=no])

    AC_MSG_RESULT($ac_cv_file__dev_zero)
fi

# Now we determine which one is our anonymous shmem preference.
haveshmgetanon="0"
havemmapzero="0"
havemmapanon="0"
APR_BEGIN_DECISION([anonymous shared memory allocation method])
APR_IFALLYES(header:sys/ipc.h header:sys/shm.h header:sys/file.h dnl
             func:shmget func:shmat func:shmdt func:shmctl,
             [haveshmgetanon="1"
              APR_DECIDE(USE_SHMEM_SHMGET_ANON, [SysV IPC shmget()])])
APR_IFALLYES(header:sys/mman.h func:mmap func:munmap file:/dev/zero,
             [havemmapzero="1"
              APR_DECIDE(USE_SHMEM_MMAP_ZERO, 
                  [SVR4-style mmap() on /dev/zero])])
APR_IFALLYES(header:sys/mman.h func:mmap func:munmap define:MAP_ANON,
             [havemmapanon="1"
              APR_DECIDE(USE_SHMEM_MMAP_ANON, 
                  [4.4BSD-style mmap() via MAP_ANON])])
APR_IFALLYES(header:os2.h,
             [haveos2shm="1"
              APR_DECIDE(USE_SHMEM_OS2_ANON, [OS/2 DosAllocSharedMem()])])
APR_IFALLYES(header:kernel/OS.h func:create_area,
             [havebeosshm="1"
              APR_DECIDE(USE_SHMEM_BEOS_ANON,
                         [BeOS areas])])
APR_IFALLYES(header:windows.h func:CreateFileMapping,
             [havewin32shm="1"
              APR_DECIDE(USE_SHMEM_WIN32_ANON,
                         [Windows CreateFileMapping()])])
case $host in
    *linux* ) 
        # Linux has problems with MM_SHMT_MMANON even though it reports
        # that it has it.
        # FIXME - find exact 2.3 version that MMANON was fixed in.  It is
        # confirmed fixed in 2.4 series.
        if test $os_pre24linux -eq 1; then
            AC_MSG_WARN([Disabling anon mmap() support for Linux pre-2.4])
            APR_DECISION_OVERRIDE(USE_SHMEM_MMAP_ZERO USE_SHMEM_SHMGET_ANON)
        fi
        ;;
    *hpux11* ) 
        APR_DECISION_OVERRIDE(USE_SHMEM_SHMGET_ANON)
        ;;
esac
APR_END_DECISION
AC_DEFINE_UNQUOTED($ac_decision)

useshmgetanon="0"
usemmapzero="0"
usemmapanon="0"

case $ac_decision in
    USE_SHMEM_SHMGET_ANON )
        useshmgetanon="1"
        ;;
    USE_SHMEM_MMAP_ZERO )
        usemmapzero="1"
        ;;
    USE_SHMEM_MMAP_ANON )
        usemmapanon="1"
        ;;
esac

AC_SUBST(useshmgetanon)
AC_SUBST(usemmapzero)
AC_SUBST(usemmapanon)
AC_SUBST(haveshmgetanon)
AC_SUBST(havemmapzero)
AC_SUBST(havemmapanon)

# Now we determine which one is our name-based shmem preference.
havemmaptmp="0"
havemmapshm="0"
haveshmget="0"
havebeosarea="0"
haveos2shm="0"
havewin32shm="0"
APR_BEGIN_DECISION([namebased memory allocation method])
APR_IFALLYES(header:sys/mman.h func:mmap func:munmap,
             [havemmaptmp="1"
              APR_DECIDE(USE_SHMEM_MMAP_TMP, 
                  [Classical mmap() on temporary file])])
APR_IFALLYES(header:sys/mman.h func:mmap func:munmap func:shm_open dnl
             func:shm_unlink,
             [havemmapshm="1"
              APR_DECIDE(USE_SHMEM_MMAP_SHM, 
                  [mmap() via POSIX.1 shm_open() on temporary file])])
APR_IFALLYES(header:sys/ipc.h header:sys/shm.h header:sys/file.h dnl
             func:shmget func:shmat func:shmdt func:shmctl,
             [haveshmget="1"
              APR_DECIDE(USE_SHMEM_SHMGET, [SysV IPC shmget()])])
APR_IFALLYES(header:kernel/OS.h func:create_area,
             [havebeosshm="1"
              APR_DECIDE(USE_SHMEM_BEOS, [BeOS areas])])
APR_IFALLYES(header:os2.h,
             [haveos2shm="1"
              APR_DECIDE(USE_SHMEM_OS2, [OS/2 DosAllocSharedMem()])])
APR_IFALLYES(header:windows.h,
             [havewin32shm="1"
              APR_DECIDE(USE_SHMEM_WIN32, [Windows shared memory])])
AC_ARG_ENABLE(posix-shm,
[  --enable-posix-shm      Use POSIX shared memory (shm_open) if available],
[
if test "$havemmapshm" = "1"; then
  APR_DECISION_OVERRIDE(USE_SHMEM_MMAP_SHM)
fi
])
case $host in
    *linux* ) 
        # Linux pre-2.4 had problems with MM_SHMT_MMANON even though
        # it reports that it has it.
        if test $os_pre24linux -eq 1; then
            APR_DECISION_OVERRIDE(USE_SHMEM_MMAP_TMP USE_SHMEM_MMAP_SHM dnl
                                  USE_SHMEM_SHMGET)
        fi
        ;;
esac
APR_END_DECISION
AC_DEFINE_UNQUOTED($ac_decision)

usemmaptmp="0"
usemmapshm="0"
useshmget="0"
usebeosarea="0"
useos2shm="0"
usewin32shm="0"

case $ac_decision in
    USE_SHMEM_MMAP_TMP )
        usemmaptmp="1"
        ;;
    USE_SHMEM_MMAP_SHM )
        usemmapshm="1"
        ;;
    USE_SHMEM_SHMGET )
        useshmget="1"
        ;;
    USE_SHMEM_BEOS )
        usebeosarea="1"
        ;;
    USE_SHMEM_OS2 )
        useos2shm="1"
        ;;
    USE_SHMEM_WIN32 )
        usewin32shm="1"
        ;;
esac

# Do we have any shared memory support?
if test "$usemmaptmp$usemmapshm$usemmapzero$useshmget$usemmapanon$usebeosarea$useos2shm$usewin32shm" = "00000000"; then
  sharedmem="0"
else
  sharedmem="1"
fi

AC_SUBST(usemmaptmp)
AC_SUBST(usemmapshm)
AC_SUBST(useshmget)
AC_SUBST(usebeosarea)
AC_SUBST(useos2shm)
AC_SUBST(usewin32shm)
AC_SUBST(havemmaptmp)
AC_SUBST(havemmapshm)
AC_SUBST(haveshmget)
AC_SUBST(havebeosarea)
AC_SUBST(haveos2shm)
AC_SUBST(havewin32shm)
AC_SUBST(sharedmem)

dnl ----------------------------- Checks for Any required Functions
dnl Checks for library functions. (N.B. poll is further down)

AC_FUNC_ALLOCA

AC_CHECK_FUNCS([calloc setsid isinf isnan \
                getenv putenv setenv unsetenv \
                writev getifaddrs utime utimes])
AC_CHECK_FUNCS(setrlimit, [ have_setrlimit="1" ], [ have_setrlimit="0" ]) 
AC_CHECK_FUNCS(getrlimit, [ have_getrlimit="1" ], [ have_getrlimit="0" ]) 
sendfile="0"
AC_CHECK_LIB(sendfile, sendfilev)
AC_CHECK_FUNCS(sendfile send_file sendfilev, [ sendfile="1" ])

dnl THIS MUST COME AFTER THE THREAD TESTS - FreeBSD doesn't always have a
dnl threaded poll() and we don't want to use sendfile on early FreeBSD 
dnl systems if we are also using threads.

AC_ARG_WITH(sendfile, [  --with-sendfile         Override decision to use sendfile],
  [ if test "$withval" = "yes"; then
        sendfile="1"
    else
        sendfile="0"
    fi ], [
    orig_sendfile=$sendfile
    case $host in
        *freebsd*)
            # FreeBSD < 4.2 has issues with threads+sendfile
            if test $os_version -le "401999"; then
                if test "$threads" = "1"; then
                    sendfile="0"
                fi
            fi
            ;;
        *alpha*-dec-osf* )
            sendfile="0"
            ;;
        s390-*-linux-gnu)
            # disable sendfile support for 2.2 on S/390
            if test $os_pre24linux -eq 1; then
                AC_MSG_WARN([Disabled sendfile support for Linux 2.2 on S/390])
                sendfile="0"
            fi
            ;;
        *aix*)
            # compiler-independent check for 64-bit build
            AC_CHECK_SIZEOF(void*, 4)
            if test "x$ac_cv_sizeof_voidp" = "x8"; then
                # sendfile not working for 64-bit build
                sendfile="0"
            fi
            ;;
    esac       
    if test "$orig_sendfile" != "$sendfile"; then
      AC_MSG_NOTICE([sendfile support disabled to avoid system problem])
    fi ] )
AC_SUBST(sendfile)

AC_CHECK_FUNCS(sigaction, [ have_sigaction="1" ], [ have_sigaction="0" ]) 
AC_DECL_SYS_SIGLIST

AC_CHECK_FUNCS(fork, [ fork="1" ], [ fork="0" ])
APR_CHECK_INET_ADDR
APR_CHECK_INET_NETWORK
AC_SUBST(apr_inaddr_none)
AC_CHECK_FUNC(_getch)
AC_CHECK_FUNCS(strerror_r, [ strerror_r="1" ], [ strerror_r="0" ])
if test "$strerror_r" = "1"; then
  APR_CHECK_STRERROR_R_RC
fi
AC_CHECK_FUNCS(mmap, [ mmap="1" ], [ mmap="0" ])
if test "$native_mmap_emul" = "1"; then
    mmap="1"
fi
AC_CHECK_FUNCS(memmove, [ have_memmove="1" ], [have_memmove="0" ])
AC_CHECK_FUNCS([getpass getpassphrase gmtime_r localtime_r])
case $host in
    *-hp-hpux*)
        dnl mkstemp is limited to 26 temporary files (a-z); use APR replacement
        ;;
    *)
        AC_CHECK_FUNCS(mkstemp mkostemp)
        ;;
esac

AC_SUBST(fork)
AC_SUBST(have_inet_addr)
AC_SUBST(tcp_nodelay_inherited)
AC_SUBST(o_nonblock_inherited)
AC_SUBST(have_inet_network)
AC_SUBST(have_sigaction)
AC_SUBST(have_setrlimit)
AC_SUBST(have_getrlimit)
AC_SUBST(mmap)
AC_SUBST(have_memmove)

APR_CHECK_SIGWAIT_ONE_ARG

dnl ----------------------------- Checks for Any required Headers
AC_HEADER_STDC

APR_FLAG_HEADERS(
    aio.h               \
    ByteOrder.h		\
    conio.h		\
    crypt.h		\
    ctype.h		\
    dir.h		\
    dirent.h		\
    dl.h		\
    dlfcn.h		\
    errno.h		\
    fcntl.h		\
    grp.h		\
    ifaddrs.h           \
    io.h		\
    limits.h		\
    mach-o/dyld.h	\
    malloc.h		\
    memory.h		\
    netdb.h		\
    osreldate.h		\
    poll.h		\
    process.h		\
    pwd.h		\
    semaphore.h		\
    signal.h		\
    stdarg.h		\
    stddef.h		\
    stdio.h		\
    stdlib.h		\
    string.h		\
    strings.h		\
    sysapi.h		\
    sysgtime.h		\
    termios.h		\
    time.h		\
    tpfeq.h		\
    tpfio.h		\
    unistd.h		\
    unix.h		\
    windows.h		\
    winsock2.h		\
    ws2tcpip.h		\
    arpa/inet.h		\
    kernel/OS.h		\
    net/errno.h		\
    netinet/in.h	\
    netinet/sctp.h      \
    netinet/sctp_uio.h  \
    sys/file.h		\
    sys/ioctl.h         \
    sys/mman.h		\
    sys/param.h         \
    sys/poll.h		\
    sys/resource.h	\
    sys/select.h	\
    sys/sem.h		\
    sys/sendfile.h	\
    sys/signal.h	\
    sys/socket.h	\
    sys/sockio.h	\
    sys/stat.h          \
    sys/sysctl.h	\
    sys/syslimits.h	\
    sys/time.h		\
    sys/types.h		\
    sys/uio.h		\
    sys/un.h		\
    sys/wait.h)

# Windows' <mswsock.h> requires <windows.h> first
AC_CACHE_CHECK([for mswsock.h], [apr_cv_hdr_mswsock_h],
[AC_TRY_CPP(
[#include <windows.h>
#include <mswsock.h>
], [apr_cv_hdr_mswsock_h=yes], [apr_cv_hdr_mswsock_h=no])])
if test "$apr_cv_hdr_mswsock_h" = "yes"; then
   mswsockh=1
else
   mswsockh=0
fi

# IRIX 6.5 has a problem in <netinet/tcp.h> which prevents it from
# being included by itself.  Check for <netinet/tcp.h> manually,
# including another header file first.
AC_CACHE_CHECK([for netinet/tcp.h], [apr_cv_hdr_netinet_tcp_h],
[AC_TRY_CPP(
[#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <netinet/tcp.h>
], [apr_cv_hdr_netinet_tcp_h=yes], [apr_cv_hdr_netinet_tcp_h=no])])
if test "$apr_cv_hdr_netinet_tcp_h" = "yes"; then
   netinet_tcph=1
   AC_DEFINE([HAVE_NETINET_TCP_H], 1, [Defined if netinet/tcp.h is present])
else
   netinet_tcph=0
fi

AC_SUBST(aioh)
AC_SUBST(arpa_ineth)
AC_SUBST(conioh)
AC_SUBST(ctypeh)
AC_SUBST(crypth)
AC_SUBST(errnoh)
AC_SUBST(direnth)
AC_SUBST(fcntlh)
AC_SUBST(ioh)
AC_SUBST(ifaddrsh)
AC_SUBST(limitsh)
AC_SUBST(mswsockh)
AC_SUBST(netdbh)
AC_SUBST(netinet_inh)
AC_SUBST(netinet_sctph)
AC_SUBST(netinet_sctp_uioh)
AC_SUBST(netinet_tcph)
AC_SUBST(stdargh)
AC_SUBST(stddefh)
AC_SUBST(stdioh)
AC_SUBST(stdlibh)
AC_SUBST(stringh)
AC_SUBST(stringsh)
AC_SUBST(sys_ioctlh)
AC_SUBST(sys_sendfileh)
AC_SUBST(sys_signalh)
AC_SUBST(sys_socketh)
AC_SUBST(sys_sockioh)
AC_SUBST(sys_syslimitsh)
AC_SUBST(sys_typesh)
AC_SUBST(sys_timeh)
AC_SUBST(sys_uioh)
AC_SUBST(sys_unh)
AC_SUBST(timeh)
AC_SUBST(unistdh)
AC_SUBST(signalh)
AC_SUBST(sys_waith)
AC_SUBST(processh)
AC_SUBST(pthreadh)
AC_SUBST(semaphoreh)
AC_SUBST(windowsh)
AC_SUBST(winsock2h)
AC_SUBST(ws2tcpiph)

# Checking for h_errno in <netdb.h>
if test "$netdbh" = "1"; then
  APR_CHECK_H_ERRNO_FLAG
  if test "$ac_cv_h_errno_cflags" = "no"; then
    AC_MSG_ERROR([can not find h_errno in netdb.h])
  fi
fi

AC_ARG_ENABLE(allocator-uses-mmap,
  [  --enable-allocator-uses-mmap    Use mmap in apr_allocator instead of malloc ],
  [ if test "$enableval" = "yes"; then
        APR_IFALLYES(header:sys/mman.h func:mmap func:munmap define:MAP_ANON,
                     [AC_DEFINE(APR_ALLOCATOR_USES_MMAP, 1,
                                [Define if apr_allocator should use mmap]) ],
                     [AC_MSG_ERROR([mmap()/MAP_ANON not supported]) ]
                   )
    fi ]
)

AC_ARG_ENABLE(allocator-guard-pages,
  [  --enable-allocator-guard-pages  Use guard pages in apr_allocator
                                  (implies --enable-allocator-uses-mmap) ] ,
  [ if test "$enableval" = "yes"; then
        APR_IFALLYES(header:sys/mman.h func:mmap func:munmap func:mprotect define:MAP_ANON,
                     [AC_DEFINE(APR_ALLOCATOR_GUARD_PAGES, 1,
                                [Define if apr_allocator should use guard pages]) ],
                     [AC_MSG_ERROR([mmap()/MAP_ANON/mprotect() not supported]) ]
                   )
    fi ]
)


AC_ARG_ENABLE(pool-concurrency-check,
  [  --enable-pool-concurrency-check Check for concurrent usage of memory pools],
  [ if test "$enableval" = "yes"; then
    AC_DEFINE(APR_POOL_CONCURRENCY_CHECK, 1,
               [Define if pool functions should abort if concurrent usage is detected])
    fi ]
)

dnl ----------------------------- Checks for standard typedefs
AC_TYPE_OFF_T
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_UID_T
AC_CHECK_TYPE(ssize_t, int)
AC_C_INLINE
AC_C_CONST
AC_FUNC_SETPGRP

APR_CHECK_SOCKLEN_T

dnl Checks for pointer size
AC_CHECK_SIZEOF(void*, 4)

if test "x$ac_cv_sizeof_voidp" != "x"; then
    voidp_size=$ac_cv_sizeof_voidp
else
    AC_ERROR([Cannot determine size of void*])
fi

dnl Checks for integer size
AC_CHECK_SIZEOF(char, 1)
AC_CHECK_SIZEOF(int, 4)
AC_CHECK_SIZEOF(long, 4)
AC_CHECK_SIZEOF(short, 2)
AC_CHECK_SIZEOF(long long, 8)

if test "$ac_cv_sizeof_short" = "2"; then
    short_value=short
fi
if test "$ac_cv_sizeof_int" = "4"; then
    int_value=int
fi
# Now we need to find what apr_int64_t (sizeof == 8) will be.
# The first match is our preference.
if test "$ac_cv_sizeof_int" = "8"; then
    int64_literal='#define APR_INT64_C(val) (val)'
    uint64_literal='#define APR_UINT64_C(val) (val##U)'
    int64_t_fmt='#define APR_INT64_T_FMT "d"'
    uint64_t_fmt='#define APR_UINT64_T_FMT "u"'
    uint64_t_hex_fmt='#define APR_UINT64_T_HEX_FMT "x"'
    int64_value="int"
    long_value=int
    int64_strfn="strtoi"
elif test "$ac_cv_sizeof_long" = "8"; then
    int64_literal='#define APR_INT64_C(val) (val##L)'
    uint64_literal='#define APR_UINT64_C(val) (val##UL)'
    int64_t_fmt='#define APR_INT64_T_FMT "ld"'
    uint64_t_fmt='#define APR_UINT64_T_FMT "lu"'
    uint64_t_hex_fmt='#define APR_UINT64_T_HEX_FMT "lx"'
    int64_value="long"
    long_value=long
    int64_strfn="strtol"
elif test "$ac_cv_sizeof_long_long" = "8"; then
    int64_literal='#define APR_INT64_C(val) (val##LL)'
    uint64_literal='#define APR_UINT64_C(val) (val##ULL)'
    # Linux, Solaris, FreeBSD all support ll with printf.
    # BSD 4.4 originated 'q'.  Solaris is more popular and 
    # doesn't support 'q'.  Solaris wins.  Exceptions can
    # go to the OS-dependent section.
    int64_t_fmt='#define APR_INT64_T_FMT "lld"'
    uint64_t_fmt='#define APR_UINT64_T_FMT "llu"'
    uint64_t_hex_fmt='#define APR_UINT64_T_HEX_FMT "llx"'
    int64_value="long long"
    long_value="long long"
    int64_strfn="strtoll"
elif test "$ac_cv_sizeof_longlong" = "8"; then
    int64_literal='#define APR_INT64_C(val) (val##LL)'
    uint64_literal='#define APR_UINT64_C(val) (val##ULL)'
    int64_t_fmt='#define APR_INT64_T_FMT "qd"'
    uint64_t_fmt='#define APR_UINT64_T_FMT "qu"'
    uint64_t_hex_fmt='#define APR_UINT64_T_HEX_FMT "qx"'
    int64_value="__int64"
    long_value="__int64"
    int64_strfn="strtoll"
else
    # int64_literal may be overriden if your compiler thinks you have
    # a 64-bit value but APR does not agree.
    AC_ERROR([could not detect a 64-bit integer type])
fi

# If present, allow the C99 macro INT64_C to override our conversion.
#
# HP-UX's ANSI C compiler provides this without any includes, so we
# will first look for INT64_C without adding stdint.h
AC_CACHE_CHECK([for INT64_C], [apr_cv_define_INT64_C], [
AC_EGREP_CPP(YES_IS_DEFINED,
[#ifdef INT64_C
YES_IS_DEFINED
#endif], [apr_cv_define_INT64_C=yes], [
    # Now check for INT64_C in stdint.h
    AC_EGREP_CPP(YES_IS_DEFINED, [#include <stdint.h>
#ifdef INT64_C
YES_IS_DEFINED
#endif], [apr_cv_define_INT64_C=yes], [apr_cv_define_INT64_C=no])])])

if test "$apr_cv_define_INT64_C" = "yes"; then
    int64_literal='#define APR_INT64_C(val) INT64_C(val)'
    uint64_literal='#define APR_UINT64_C(val) UINT64_C(val)'
    stdint=1
else
    stdint=0
fi

if test "$ac_cv_type_size_t" = "yes"; then
    size_t_value="size_t"
else
    size_t_value="apr_int32_t"
fi
if test "$ac_cv_type_ssize_t" = "yes"; then
    ssize_t_value="ssize_t"
else
    ssize_t_value="apr_int32_t"
fi
if test "$ac_cv_socklen_t" = "yes"; then
    socklen_t_value="socklen_t"
    case $host in
        *-hp-hpux*)
            if test "$ac_cv_sizeof_long" = "8"; then
                # 64-bit HP-UX requires 32-bit socklens in
                # kernel, but user-space declarations say
                # 64-bit (socklen_t == size_t == long).
                # This will result in many compile warnings,
                # but we're functionally busted otherwise.
                socklen_t_value="int"
            fi
            ;;
    esac
else
    socklen_t_value="int"
fi

APR_CHECK_SIZEOF_EXTENDED([#include <sys/types.h>], pid_t, 8)

if test "$ac_cv_sizeof_pid_t" = "$ac_cv_sizeof_short"; then
    pid_t_fmt='#define APR_PID_T_FMT "hd"'
elif test "$ac_cv_sizeof_pid_t" = "$ac_cv_sizeof_int"; then
    pid_t_fmt='#define APR_PID_T_FMT "d"'
elif test "$ac_cv_sizeof_pid_t" = "$ac_cv_sizeof_long"; then
    pid_t_fmt='#define APR_PID_T_FMT "ld"'
elif test "$ac_cv_sizeof_pid_t" = "$ac_cv_sizeof_long_long"; then
    pid_t_fmt='#define APR_PID_T_FMT APR_INT64_T_FMT'
else
    pid_t_fmt='#error Can not determine the proper size for pid_t'
fi

# Basically, we have tried to figure out the correct format strings
# for APR types which vary between platforms, but we don't always get
# it right.
case $host in
   s390*linux*)
       # uniquely, the 31-bit Linux/s390 uses "unsigned long int"
       # for size_t rather than "unsigned int":
       size_t_fmt="lu"
       ssize_t_fmt="ld"
       ;;
   *-os2*)
       size_t_fmt="lu"
       ;;
   *-solaris*)
       if test "$ac_cv_sizeof_long" = "8"; then
         pid_t_fmt='#define APR_PID_T_FMT "d"'
       else
         pid_t_fmt='#define APR_PID_T_FMT "ld"'
       fi
       ;;
   *aix4*|*aix5*)
       ssize_t_fmt="ld"
       size_t_fmt="lu"
       ;;
    *beos*)
        ssize_t_fmt="ld"
        size_t_fmt="ld"
        ;;
    *apple-darwin*)
        osver=`uname -r`
        case $osver in
           [[0-7]].*)
              ssize_t_fmt="d"
              ;;
           *)
              ssize_t_fmt="ld"
              ;;
        esac
        size_t_fmt="lu"
        ;;
    *-mingw*)
        int64_t_fmt='#define APR_INT64_T_FMT "I64d"'
        uint64_t_fmt='#define APR_UINT64_T_FMT "I64u"'
        uint64_t_hex_fmt='#define APR_UINT64_T_HEX_FMT "I64x"'
        int64_value="__int64"
        long_value="__int64"
        int64_strfn="_strtoi64"
        ;;
esac

APR_CHECK_TYPES_COMPATIBLE(ssize_t, int, [ssize_t_fmt="d"])
APR_CHECK_TYPES_COMPATIBLE(ssize_t, long, [ssize_t_fmt="ld"])
APR_CHECK_TYPES_COMPATIBLE(size_t, unsigned int, [size_t_fmt="u"])
APR_CHECK_TYPES_COMPATIBLE(size_t, unsigned long, [size_t_fmt="lu"])

APR_CHECK_SIZEOF_EXTENDED([#include <sys/types.h>], ssize_t, 8)

AC_MSG_CHECKING([which format to use for apr_ssize_t])
if test -n "$ssize_t_fmt"; then
    AC_MSG_RESULT(%$ssize_t_fmt)
elif test "$ac_cv_sizeof_ssize_t" = "$ac_cv_sizeof_int"; then
    ssize_t_fmt="d"
    AC_MSG_RESULT(%d)
elif test "$ac_cv_sizeof_ssize_t" = "$ac_cv_sizeof_long"; then
    ssize_t_fmt="ld"
    AC_MSG_RESULT(%ld)
else
    AC_ERROR([could not determine the proper format for apr_ssize_t])
fi

ssize_t_fmt="#define APR_SSIZE_T_FMT \"$ssize_t_fmt\""

APR_CHECK_SIZEOF_EXTENDED([#include <stddef.h>], size_t, 8)

AC_MSG_CHECKING([which format to use for apr_size_t])
if test -n "$size_t_fmt"; then
    AC_MSG_RESULT(%$size_t_fmt)
elif test "$ac_cv_sizeof_size_t" = "$ac_cv_sizeof_int"; then
    size_t_fmt="d"
    AC_MSG_RESULT(%d)
elif test "$ac_cv_sizeof_size_t" = "$ac_cv_sizeof_long"; then
    size_t_fmt="ld"
    AC_MSG_RESULT(%ld)
else
    AC_ERROR([could not determine the proper format for apr_size_t])
fi

size_t_fmt="#define APR_SIZE_T_FMT \"$size_t_fmt\""

APR_CHECK_SIZEOF_EXTENDED([#include <sys/types.h>], off_t, 8)

if test "${ac_cv_sizeof_off_t}${apr_cv_use_lfs64}" = "4yes"; then
    # Enable LFS
    aprlfs=1
    AC_CHECK_FUNCS([mmap64 sendfile64 sendfilev64 readdir64_r])
    case $host in
        *-hp-hpux*)
            dnl mkstemp64 is limited to 26 temporary files (a-z); use APR replacement
            ;;
        *)
            AC_CHECK_FUNCS(mkstemp64 mkostemp64)
            ;;
    esac
elif test "${ac_cv_sizeof_off_t}" != "${ac_cv_sizeof_size_t}"; then
    # unsure of using -gt above is as portable, can can't forsee where
    # off_t can legitimately be smaller than size_t
    aprlfs=1
else
    aprlfs=0     
fi

AC_MSG_CHECKING([which type to use for apr_off_t])
if test "${ac_cv_sizeof_off_t}${apr_cv_use_lfs64}" = "4yes"; then
    # LFS is go!
    off_t_fmt='#define APR_OFF_T_FMT APR_INT64_T_FMT'
    off_t_value='off64_t'
    off_t_strfn='apr_strtoi64'
elif test "${ac_cv_sizeof_off_t}x${ac_cv_sizeof_long}" = "4x4"; then
    # Special case: off_t may change size with _FILE_OFFSET_BITS
    # on 32-bit systems with LFS support.  To avoid compatibility
    # issues when other packages do define _FILE_OFFSET_BITS,
    # hard-code apr_off_t to long.
    off_t_value=long
    off_t_fmt='#define APR_OFF_T_FMT "ld"'
    off_t_strfn='strtol'
elif test "$ac_cv_type_off_t" = "yes"; then
    off_t_value=off_t
    # off_t is more commonly a long than an int; prefer that case
    # where int and long are the same size.
    if test "$ac_cv_sizeof_off_t" = "$ac_cv_sizeof_long"; then
        off_t_fmt='#define APR_OFF_T_FMT "ld"'
        off_t_strfn='strtol'
    elif test "$ac_cv_sizeof_off_t" = "$ac_cv_sizeof_int"; then
        off_t_fmt='#define APR_OFF_T_FMT "d"'
        off_t_strfn='strtoi'
    elif test "$ac_cv_sizeof_off_t" = "$ac_cv_sizeof_long_long"; then
        off_t_fmt='#define APR_OFF_T_FMT APR_INT64_T_FMT'
        off_t_strfn='apr_strtoi64'
    else
        AC_ERROR([could not determine the size of off_t])
    fi
    # Per OS tuning...
    case $host in
    *-mingw*)
        off_t_value=apr_int64_t
        off_t_fmt='#define APR_OFF_T_FMT "I64d"'
        off_t_strfn='_strtoi64'
        ;;
    esac
else
    # Fallback on int
    off_t_value=apr_int64_t
    off_t_fmt='#define APR_OFF_T_FMT "d"'
    off_t_strfn='strtoi'
fi
AC_MSG_RESULT($off_t_value)

# Regardless of whether _LARGEFILE64_SOURCE is used, on some
# platforms _FILE_OFFSET_BITS will affect the size of ino_t and hence
# the build-time ABI may be different from the apparent ABI when using
# APR with another package which *does* define _FILE_OFFSET_BITS.
# (Exactly as per the case above with off_t where LFS is *not* used)
#
# To be safe, hard-code apr_ino_t as 'unsigned long' or 'unsigned int'
# iff that is exactly the size of ino_t here; otherwise use ino_t as existing
# releases did.  To be correct, apr_ino_t should have been made an
# ino64_t as apr_off_t is off64_t, but this can't be done now without
# breaking ABI.

# Per OS tuning...
case $host in
*mingw*)
    ino_t_value=apr_int64_t
    ;;
*)
    ino_t_value=ino_t
    APR_CHECK_SIZEOF_EXTENDED(AC_INCLUDES_DEFAULT, ino_t, $ac_cv_sizeof_long)
    if test $ac_cv_sizeof_ino_t = 4; then
        if test $ac_cv_sizeof_long = 4; then
            ino_t_value="unsigned long"
        else
            ino_t_value="unsigned int"
        fi
    fi
    ;;
esac
AC_MSG_NOTICE([using $ino_t_value for ino_t])

# Checks for endianness
AC_C_BIGENDIAN
if test $ac_cv_c_bigendian = yes; then
    bigendian=1
else
    bigendian=0
fi

APR_CHECK_SIZEOF_EXTENDED([#include <sys/types.h>
#include <sys/uio.h>],struct iovec,0)
if test "$ac_cv_sizeof_struct_iovec" = "0"; then
    have_iovec=0
else
    have_iovec=1
fi

AC_SUBST(voidp_size)
AC_SUBST(short_value)
AC_SUBST(int_value)
AC_SUBST(long_value)
AC_SUBST(int64_value)
AC_SUBST(off_t_value)
AC_SUBST(size_t_value)
AC_SUBST(ssize_t_value)
AC_SUBST(socklen_t_value)
AC_SUBST(int64_t_fmt) 
AC_SUBST(uint64_t_fmt) 
AC_SUBST(uint64_t_hex_fmt) 
AC_SUBST(ssize_t_fmt) 
AC_SUBST(size_t_fmt)
AC_SUBST(off_t_fmt) 
AC_SUBST(pid_t_fmt)
AC_SUBST(int64_literal) 
AC_SUBST(uint64_literal) 
AC_SUBST(stdint) 
AC_SUBST(bigendian)
AC_SUBST(aprlfs)
AC_SUBST(have_iovec)
AC_SUBST(ino_t_value)

dnl ----------------------------- Checking for string functions
AC_CHECK_FUNCS(strnicmp, have_strnicmp="1", have_strnicmp="0")
AC_CHECK_FUNCS(strncasecmp, have_strncasecmp="1", have_strncasecmp="0")
AC_CHECK_FUNCS(stricmp, have_stricmp="1", have_stricmp="0")
AC_CHECK_FUNCS(strcasecmp, have_strcasecmp="1", have_strcasecmp="0")
AC_CHECK_FUNCS(strdup, have_strdup="1", have_strdup="0")
AC_CHECK_FUNCS(strstr, have_strstr="1", have_strstr="0")
AC_CHECK_FUNCS(memchr, have_memchr="1", have_memchr="0")
AC_CHECK_FUNC($int64_strfn, have_int64_strfn="1", have_int64_strfn="0")

dnl ----------------------------- We have a fallback position
if test "$have_int64_strfn" = "0" && test "$int64_strfn" = "strtoll"; then
    int64_strfn="strtoq"
    AC_CHECK_FUNC(strtoq, [have_int64_strfn=1], [have_int64_strfn=0])
fi

if test "$have_int64_strfn" = "1"; then
  AC_DEFINE_UNQUOTED(APR_INT64_STRFN, [$int64_strfn],
      [Define as function which can be used for conversion of strings to apr_int64_t])
fi

AC_SUBST(have_strnicmp)
AC_SUBST(have_strncasecmp)
AC_SUBST(have_stricmp)
AC_SUBST(have_strcasecmp)
AC_SUBST(have_strdup)
AC_SUBST(have_strstr)
AC_SUBST(have_memchr)

if test "$off_t_strfn" = "apr_strtoi64" && test "$have_int64_strfn" = "1"; then
    off_t_strfn=$int64_strfn
fi
AC_DEFINE_UNQUOTED(APR_OFF_T_STRFN, [$off_t_strfn],
          [Define as function used for conversion of strings to apr_off_t])

dnl ----------------------------- Checking for DSO support
AC_MSG_NOTICE([])
AC_MSG_NOTICE([Checking for DSO...])

AC_ARG_ENABLE(dso,
  [  --disable-dso           Disable DSO support ],
  [if test "x$enableval" = "xyes"; then
      dsotype=any
   else
      dsotype=$enableval
   fi
  ], [dsotype=any])

if test "$dsotype" = "any"; then
    if test "$dsotype" = "any"; then
      case $host in
        *darwin[[0-8]]\.*) 
          # Original Darwin, not for 9.0!:
          AC_CHECK_FUNC(NSLinkModule, [dsotype=dyld]);;
        hppa*-hpux[[1-9]]\.*|hppa*-hpux1[[01]]*)
          # shl is specific to parisc hpux SOM binaries, not used for 64 bit
          AC_CHECK_LIB(dld, shl_load, [have_shl=1])
          if test "$ac_cv_sizeof_voidp$have_shl" = "41"; then
            dsotype=shl; APR_ADDTO(LIBS,-ldld)
          fi;;
        *-mingw*|*-os2*)
          # several 'other's below probably belong up here.  If they always
          # use a platform implementation and shouldn't test the dlopen/dlfcn
          # features, then bring them up here.
          # But if they -should- optionally use dlfcn, and/or need the config
          # detection of dlopen/dlsym, do not move them up.
          dsotype=other ;;
      esac
    fi
    # Normal POSIX:
    if test "$dsotype" = "any"; then
      AC_CHECK_FUNC(dlopen, [dsotype=dlfcn])
    fi
    if test "$dsotype" = "any"; then
      AC_CHECK_LIB(dl, dlopen, [dsotype=dlfcn; APR_ADDTO(LIBS,-ldl)])
    fi
    if test "$dsotype" = "dlfcn"; then
        # ReliantUnix has dlopen() in libc but dlsym() in libdl :(
        AC_CHECK_FUNC(dlsym, [], 
          [AC_CHECK_LIB(dl, dlsym, 
             [APR_ADDTO(LIBS, -ldl)],
             [dsotype=any
              AC_MSG_WARN([Weird: dlopen() was found but dlsym() was not found!])])])
    fi
    if test "$dsotype" = "any"; then
      # BeOS:
      AC_CHECK_LIB(root, load_image, [dsotype=other])
    fi
    # Everything else:
    if test "$dsotype" = "any"; then
        case $host in
        *os390|*os400|*-aix*)
          # Some -aix5 will use dl, no hassles.  Keep that pattern here.
          dsotype=other ;;
        *-hpux*)
          if test "$have_shl" = "1"; then
            dsotype=shl; APR_ADDTO(LIBS,-ldld)
          fi;;
        esac
    fi
fi

if test "$dsotype" = "any"; then
    AC_MSG_ERROR([Could not detect suitable DSO implementation])
elif test "$dsotype" = "no"; then
    aprdso="0"
else
    case "$dsotype" in
    dlfcn) AC_DEFINE(DSO_USE_DLFCN, 1, [Define if DSO support uses dlfcn.h]);;
    shl)   AC_DEFINE(DSO_USE_SHL, 1, [Define if DSO support uses shl_load]);;
    dyld)  AC_DEFINE(DSO_USE_DYLD, 1, [Define if DSO support uses dyld.h]);;
    other) ;; # Use whatever is in dso/OSDIR
    *) AC_MSG_ERROR([Unknown DSO implementation "$dsotype"]);;
    esac
    aprdso="1"
    apr_modules="$apr_modules dso"
fi

AC_SUBST(aprdso)

dnl ----------------------------- Checking for Processes
AC_MSG_NOTICE([])
AC_MSG_NOTICE([Checking for Processes...])

AC_CHECK_FUNCS(waitpid)

AC_ARG_ENABLE(other-child,
  [  --enable-other-child    Enable reliable child processes ],
  [ if test "$enableval" = "yes"; then
        oc="1"
    else
        oc="0"
    fi ],
  [ oc=1 ] ) 
  
AC_SUBST(oc) 

if test -z "$have_proc_invoked"; then
  have_proc_invoked="0"
fi

AC_SUBST(have_proc_invoked)

AC_MSG_CHECKING(for Variable Length Arrays)
APR_TRY_COMPILE_NO_WARNING([],
[
    int foo[argc];
    foo[0] = 0;
], vla_msg=yes, vla_msg=no )
AC_MSG_RESULT([$vla_msg])
if test "$vla_msg" = "yes"; then
    AC_DEFINE(HAVE_VLA, 1, [Define if C compiler supports VLA])
fi

AC_CACHE_CHECK(struct rlimit,ac_cv_struct_rlimit,[
AC_TRY_RUN([
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
main()
{
    struct rlimit limit;
    limit.rlim_cur = 0;
    limit.rlim_max = 0;
    exit(0);
}], [
    ac_cv_struct_rlimit=yes ], [
    ac_cv_struct_rlimit=no ], [
    ac_cv_struct_rlimit=no ] ) ] )
struct_rlimit=0
test "x$ac_cv_struct_rlimit" = xyes && struct_rlimit=1
AC_SUBST(struct_rlimit)

dnl ----------------------------- Checking for Locking Characteristics 
AC_MSG_NOTICE([])
AC_MSG_NOTICE([Checking for Locking...])

AC_CHECK_FUNCS(semget semctl semop semtimedop flock)
APR_IFALLYES(func:semtimedop, have_semtimedop="1", have_semtimedop="0")

AC_CHECK_HEADERS(semaphore.h)
AC_SEARCH_LIBS(sem_open, rt)
AC_CHECK_FUNCS(sem_close sem_unlink sem_post sem_wait sem_timedwait)
APR_IFALLYES(func:sem_timedwait, have_sem_timedwait="1", have_sem_timedwait="0")

AC_CHECK_HEADERS(OS.h)
AC_CHECK_FUNCS(create_sem acquire_sem acquire_sem_etc)
APR_IFALLYES(header:OS.h func:acquire_sem_etc, have_acquire_sem_etc="1", have_acquire_sem_etc="0")

# Some systems return ENOSYS from sem_open.
AC_CACHE_CHECK(for working sem_open,ac_cv_func_sem_open,[
AC_TRY_RUN([
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <semaphore.h>
#ifndef SEM_FAILED
#define SEM_FAILED (-1)
#endif
main()
{
    sem_t *psem;
    const char *sem_name = "/apr_autoconf";

    psem = sem_open(sem_name, O_CREAT, 0644, 1);
    if (psem == (sem_t *)SEM_FAILED) {
	exit(1);
    }
    sem_close(psem);
    psem = sem_open(sem_name, O_CREAT | O_EXCL, 0644, 1);
    if (psem != (sem_t *)SEM_FAILED) {
        sem_close(psem);
        exit(1);
    }
    sem_unlink(sem_name);
    exit(0);
}], [ac_cv_func_sem_open=yes], [ac_cv_func_sem_open=no],
[ac_cv_func_sem_open=no])])

# It's stupid, but not all platforms have union semun, even those that need it.
AC_MSG_CHECKING(for union semun in sys/sem.h)
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
],[
union semun arg;
semctl(0, 0, 0, arg);
], [have_union_semun="1" union_semun=yes ]
msg=yes, [
have_union_semun="0"
msg=no ] )
AC_MSG_RESULT([$msg])
AC_SUBST(have_union_semun)

dnl Checks for libraries.
APR_CHECK_DEFINE(LOCK_EX, sys/file.h)
APR_CHECK_DEFINE(F_SETLK, fcntl.h)
APR_CHECK_DEFINE(SEM_UNDO, sys/sem.h)

# We are assuming that if the platform doesn't have POLLIN, it doesn't have
# any POLL definitions.
APR_CHECK_DEFINE_FILES(POLLIN, poll.h sys/poll.h)

if test "$threads" = "1"; then
    APR_CHECK_DEFINE(PTHREAD_PROCESS_SHARED, pthread.h)
    AC_CHECK_FUNCS(pthread_mutex_timedlock pthread_mutexattr_setpshared)
    APR_IFALLYES(header:pthread.h func:pthread_mutex_timedlock,
                 have_pthread_mutex_timedlock="1", have_pthread_mutex_timedlock="0")
    AC_SUBST(have_pthread_mutex_timedlock)
    # Some systems have setpshared and define PROCESS_SHARED, but don't 
    # really support PROCESS_SHARED locks.  So, we must validate that we 
    # can go through the steps without receiving some sort of system error.
    # Linux and older versions of AIX have this problem.
    APR_IFALLYES(header:pthread.h define:PTHREAD_PROCESS_SHARED func:pthread_mutexattr_setpshared, [
      AC_CACHE_CHECK([for working PROCESS_SHARED locks], apr_cv_process_shared_works, [
      AC_TRY_RUN([
#include <sys/types.h>
#include <pthread.h>
        int main()
        {
            pthread_mutex_t mutex;
            pthread_mutexattr_t attr;
            if (pthread_mutexattr_init(&attr))
                exit(1);
            if (pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED))
                exit(2);
            if (pthread_mutex_init(&mutex, &attr))
                exit(3);
            if (pthread_mutexattr_destroy(&attr))
                exit(4);
            if (pthread_mutex_destroy(&mutex))
                exit(5);
            exit(0);
        }], [apr_cv_process_shared_works=yes], [apr_cv_process_shared_works=no])])
      # Override detection of pthread_mutexattr_setpshared
      ac_cv_func_pthread_mutexattr_setpshared=$apr_cv_process_shared_works])

    if test "$ac_cv_func_pthread_mutexattr_setpshared" = "yes"; then
        APR_CHECK_PTHREAD_ROBUST_SHARED_MUTEX
    fi
fi

# See which lock mechanisms we can support on this system.
APR_IFALLYES(header:semaphore.h func:sem_open func:sem_close dnl
             func:sem_unlink func:sem_post func:sem_wait,
             hasposixser="1", hasposixser="0")
APR_IFALLYES(func:semget func:semctl func:semop define:SEM_UNDO,
             hassysvser="1", hassysvser="0")
APR_IFALLYES(func:flock define:LOCK_EX, hasflockser="1", hasflockser="0")
APR_IFALLYES(header:fcntl.h define:F_SETLK, hasfcntlser="1", hasfcntlser="0")
# note: the current APR use of shared mutex requires /dev/zero
APR_IFALLYES(header:pthread.h define:PTHREAD_PROCESS_SHARED dnl
             func:pthread_mutexattr_setpshared dnl
             file:/dev/zero,
             hasprocpthreadser="1", hasprocpthreadser="0")
APR_IFALLYES(header:OS.h func:create_sem, hasbeossem="1", hasbeossem="0")

# See which lock mechanism we'll select by default on this system.
# The last APR_DECIDE to execute sets the default.
# At this stage, we match the ordering in Apache 1.3
# which is (highest to lowest): sysvsem -> fcntl -> flock.
# POSIX semaphores and cross-process pthread mutexes are not
# used by default since they have less desirable behaviour when
# e.g. a process holding the mutex segfaults.
# The BEOSSEM decision doesn't require any substitutions but is
# included here to prevent the fcntl() branch being selected
# from the decision making.
APR_BEGIN_DECISION([apr_lock implementation method])
APR_IFALLYES(func:flock define:LOCK_EX,
            APR_DECIDE(USE_FLOCK_SERIALIZE, [4.2BSD-style flock()]))
APR_IFALLYES(header:fcntl.h define:F_SETLK,
            APR_DECIDE(USE_FCNTL_SERIALIZE, [SVR4-style fcntl()]))
APR_IFALLYES(func:semget func:semctl func:semop define:SEM_UNDO,
            APR_DECIDE(USE_SYSVSEM_SERIALIZE, [SysV IPC semget()]))
APR_IFALLYES(header:OS.h func:create_sem func:acquire_sem func:acquire_sem_etc, 
            APR_DECIDE(USE_BEOSSEM, [BeOS Semaphores])) 
if test "x$apr_lock_method" != "x"; then
    APR_DECISION_FORCE($apr_lock_method)
fi
APR_END_DECISION
AC_DEFINE_UNQUOTED($ac_decision)

flockser="0"
sysvser="0"
posixser="0"
procpthreadser="0"
fcntlser="0"
case $ac_decision in
    USE_FLOCK_SERIALIZE )
        flockser="1"
        ;;
    USE_FCNTL_SERIALIZE )
        fcntlser="1"
        ;;
    USE_SYSVSEM_SERIALIZE )
        sysvser="1"
        ;;
    USE_POSIXSEM_SERIALIZE )
        posixser="1"
        ;;
    USE_PROC_PTHREAD_SERIALIZE )
        procpthreadser="1"
        ;;
    USE_BEOSSEM )
        beossem="1"
        ;;
esac

if test $hasfcntlser = "1"; then
AC_MSG_CHECKING(if fcntl returns EACCES when F_SETLK is already held)
AC_TRY_RUN([
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <fcntl.h>
#include <errno.h>

int fd;
struct flock proc_mutex_lock_it = {0};
const char *fname = "conftest.fcntl";

int main()
{
    int rc, status;;
    proc_mutex_lock_it.l_whence = SEEK_SET;   /* from current point */
    proc_mutex_lock_it.l_type = F_WRLCK;      /* set exclusive/write lock */

    fd = creat(fname, S_IRWXU);
    unlink(fname);

    if (rc = lockit()) {
        exit(-1);
    }

    if (fork()) {
        wait(&status);
    }
    else {
      return(lockit());
    }

    close(fd);
    exit(WEXITSTATUS(status) != EACCES);
}

int lockit() {
    int rc;
    do {
        rc = fcntl(fd, F_SETLK, &proc_mutex_lock_it);
    } while ( rc < 0 && errno == EINTR);

    return (rc < 0) ? errno : 0;
}], [apr_fcntl_tryacquire_eacces=1], [apr_fcntl_tryacquire_eacces=0], [apr_fcntl_tryacquire_eacces=0])
fi

if test "$apr_fcntl_tryacquire_eacces" = "1"; then
  AC_DEFINE(FCNTL_TRYACQUIRE_EACCES, 1, [Define if fcntl returns EACCES when F_SETLK is already held])
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi


AC_SUBST(hasflockser)
AC_SUBST(hassysvser)
AC_SUBST(hasposixser)
AC_SUBST(hasfcntlser)
AC_SUBST(hasprocpthreadser)
AC_SUBST(flockser)
AC_SUBST(sysvser)
AC_SUBST(posixser)
AC_SUBST(fcntlser)
AC_SUBST(procpthreadser)
AC_SUBST(pthreadser)

AC_MSG_CHECKING(if all interprocess locks affect threads)
if test "x$apr_process_lock_is_global" = "xyes"; then
    proclockglobal="1"
    AC_MSG_RESULT(yes)
else
    proclockglobal="0"
    AC_MSG_RESULT(no)
fi

AC_SUBST(proclockglobal)

AC_MSG_CHECKING(if POSIX sems affect threads in the same process)
if test "x$apr_posixsem_is_global" = "xyes"; then
  AC_DEFINE(POSIXSEM_IS_GLOBAL, 1, 
            [Define if POSIX semaphores affect threads within the process])
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_MSG_CHECKING(if SysV sems affect threads in the same process)
if test "x$apr_sysvsem_is_global" = "xyes"; then
  AC_DEFINE(SYSVSEM_IS_GLOBAL, 1,
            [Define if SysV semaphores affect threads within the process])
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_MSG_CHECKING(if fcntl locks affect threads in the same process)
if test "x$apr_fcntl_is_global" = "xyes"; then
  AC_DEFINE(FCNTL_IS_GLOBAL, 1,
            [Define if fcntl locks affect threads within the process])
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_MSG_CHECKING(if flock locks affect threads in the same process)
if test "x$apr_flock_is_global" = "xyes"; then
  AC_DEFINE(FLOCK_IS_GLOBAL, 1,
            [Define if flock locks affect threads within the process])
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

dnl ----------------------------- Checking for /dev/random 
AC_MSG_CHECKING(for entropy source)

why_no_rand=""

AC_ARG_WITH(egd, 
  [  --with-egd[[=DIR]]        use EGD-compatible socket],
  [ AC_DEFINE(HAVE_EGD, 1, [Define if EGD is supported])
    if test "$withval" = "yes"; then
        AC_DEFINE_UNQUOTED(EGD_DEFAULT_SOCKET, ["/var/run/egd-pool","/dev/egd-pool","/etc/egd-pool","/etc/entropy"], 
         [Define to list of paths to EGD sockets])
    else
        AC_DEFINE_UNQUOTED(EGD_DEFAULT_SOCKET, ["$withval"])
    fi
    AC_MSG_RESULT(EGD-compatible daemon)
    rand="1"
  ])

if test "$rand" != "1"; then
  AC_ARG_WITH(devrandom,
    [  --with-devrandom[[=DEV]]  use /dev/random or compatible [[searches by default]]],
    [ apr_devrandom="$withval" ], [ apr_devrandom="yes" ])

  if test "$apr_devrandom" = "yes"; then
    # /dev/random on OpenBSD doesn't provide random data, so
    # prefer /dev/arandom, which does; see random(4).
    for f in /dev/arandom /dev/urandom /dev/random; do
      if test -r $f; then
        apr_devrandom=$f
        rand=1
        break
      fi
    done
  elif test "$apr_devrandom" != "no"; then
    if test -r "$apr_devrandom"; then
      rand="1"
    else
      AC_ERROR([$apr_devrandom not found or unreadable.])
    fi
  fi

  if test "$rand" = "1"; then
    case $host in
      *os390)
        if test $os_version -lt 1700; then
          rand="0"
          why_no_rand=" ($apr_devrandom unusable on z/OS before V1R7)"
        fi
        ;;
    esac
  fi

  if test "$rand" = "1"; then
    AC_DEFINE_UNQUOTED(DEV_RANDOM, ["$apr_devrandom"], [Define to path of random device])
    AC_MSG_RESULT([$apr_devrandom])
  fi
fi

if test "$rand" != "1"; then
    case $host in
        # we have built in support for OS/2
        *-os2*)
            AC_MSG_RESULT([Using OS/2 builtin random])
            rand="1"
            ;;
        *)
            if test "$rand" != "1"; then
              if test "$ac_cv_lib_truerand_main" = "yes"; then
                AC_DEFINE(HAVE_TRUERAND, 1, [Define if truerand is supported])
                AC_MSG_RESULT(truerand)
                rand="1"
              else
                AC_MSG_RESULT(not found$why_no_rand)
                rand="0"
              fi
            fi
            ;;
    esac
fi

AC_SUBST(rand)

dnl ----------------------------- Checking for File Info Support 
AC_MSG_NOTICE([])
AC_MSG_NOTICE([Checking for File Info Support...])
AC_CHECK_MEMBERS([struct stat.st_blocks, struct stat.st_atimensec,
struct stat.st_ctimensec, struct stat.st_mtimensec, struct stat.st_atim.tv_nsec,
struct stat.st_ctim.tv_nsec, struct stat.st_mtim.tv_nsec,
struct stat.st_atime_n, struct stat.st_ctime_n, struct stat.st_mtime_n],,,[
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif])

APR_CHECK_DIRENT_INODE
APR_CHECK_DIRENT_TYPE

dnl ----------------------------- Checking for UUID Support 
AC_MSG_NOTICE([])
AC_MSG_NOTICE([Checking for OS UUID Support...])

AC_CHECK_HEADERS(uuid.h uuid/uuid.h sys/uuid.h, break)

apr_revert_save_LIBS=$LIBS

# Prefer the flavor(s) that live in libc;
AC_SEARCH_LIBS(uuid_create, uuid)
AC_SEARCH_LIBS(uuid_generate, uuid)
if test "$ac_cv_search_uuid_create" = "none required" -o \
        "$ac_cv_search_uuid_generate" = "none required"; then
 LIBS=$apr_revert_save_LIBS
fi

AC_CHECK_FUNCS(uuid_create uuid_generate)

AC_CACHE_CHECK([for os uuid usability], [apr_cv_osuuid], [
# Ensure this test closely mirrors misc/unix/rand.c!
uuid_includes="
#if defined(HAVE_SYS_TYPES_H)
#include <sys/types.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#if defined(HAVE_UUID_H)
#include <uuid.h>
#elif defined(HAVE_UUID_UUID_H)
#include <uuid/uuid.h>
#elif defined(HAVE_SYS_UUID_H)
#include <sys/uuid.h>
#endif
"
 apr_cv_osuuid=no
 if test $ac_cv_func_uuid_create = yes; then
  AC_TRY_LINK([$uuid_includes], [
    uuid_t g;
    uint32_t s;
    uuid_create(&g, &s);
    if (s == uuid_s_ok) s = 0;
  ], [apr_cv_osuuid=yes], [apr_cv_func_uuid_create=no])
 fi
 if test $ac_cv_func_uuid_generate = yes; then
  AC_TRY_LINK([$uuid_includes], [
    uuid_t g;
    uuid_generate(g);
  ], [apr_cv_osuuid=yes], [apr_cv_func_uuid_generate=no])
 fi 
])

if test $apr_cv_osuuid = yes; then
  osuuid="1"
else
  osuuid="0"
  LIBS=$apr_revert_save_LIBS
fi
AC_SUBST(osuuid)


dnl ----------------------------- Checking for Time Support 
AC_MSG_NOTICE([])
AC_MSG_NOTICE([Checking for Time Support...])

AC_CHECK_MEMBERS([struct tm.tm_gmtoff, struct tm.__tm_gmtoff],,,[
#include <sys/types.h>
#include <time.h>])

dnl ----------------------------- Checking for Networking Support 
AC_MSG_NOTICE([])
AC_MSG_NOTICE([Checking for Networking support...])
APR_TYPE_IN_ADDR
if test "$ac_cv_type_in_addr" = "yes"; then
  have_in_addr="1"
else
  have_in_addr="0"
fi

AC_MSG_CHECKING([if fd == socket on this platform])
if test "x$file_as_socket" != "x0" ; then
    file_as_socket="1";
    AC_MSG_RESULT([yes])
else
    AC_MSG_RESULT([no])
fi

AC_SUBST(have_in_addr)
AC_SUBST(file_as_socket)

if test "$ac_cv_func_poll $file_as_socket" = "yes 1"; then
    AC_DEFINE(WAITIO_USES_POLL, 1,
              [Define if apr_wait_for_io_or_timeout() uses poll(2)])
fi

# Check the types only if we have gethostbyname_r
if test "$ac_cv_func_gethostbyname_r" = "yes"; then
    APR_CHECK_GETHOSTBYNAME_R_STYLE
fi

# Check the types only if we have getservbyname_r
if test "$ac_cv_func_getservbyname_r" = "yes"; then
    APR_CHECK_GETSERVBYNAME_R_STYLE
fi

APR_CHECK_TCP_NODELAY_INHERITED
APR_CHECK_O_NONBLOCK_INHERITED
APR_CHECK_TCP_NODELAY_WITH_CORK

# Look for a way of corking TCP...
APR_CHECK_DEFINE(TCP_CORK, netinet/tcp.h)
APR_CHECK_DEFINE(TCP_NOPUSH, netinet/tcp.h)
apr_tcp_nopush_flag="0"
have_corkable_tcp="0"
if test "x$ac_cv_define_TCP_CORK" = "xyes"; then
    apr_tcp_nopush_flag="TCP_CORK"
    have_corkable_tcp="1"
else
    case $host in
        *linux*)
            AC_EGREP_CPP(yes,[
#include <linux/socket.h>
#ifdef TCP_CORK
yes
#endif
            ],[
                apr_tcp_nopush_flag="3"
                have_corkable_tcp="1"
            ])
            ;;
        *)
            ;;
    esac
fi
if test "x$ac_cv_define_TCP_NOPUSH" = "xyes"; then
    apr_tcp_nopush_flag="TCP_NOPUSH"
    have_corkable_tcp="1"
fi

APR_CHECK_DEFINE(SO_ACCEPTFILTER, sys/socket.h)
if test "x$ac_cv_define_SO_ACCEPTFILTER" = "xyes"; then
    acceptfilter="1"
else
    acceptfilter="0"
fi

APR_CHECK_SCTP
APR_CHECK_MCAST

AC_SUBST(apr_tcp_nopush_flag)
AC_SUBST(have_corkable_tcp)
AC_SUBST(acceptfilter)
AC_SUBST(have_sctp)

AC_CHECK_FUNCS(set_h_errno)

AC_MSG_NOTICE([])
AC_MSG_NOTICE([Checking for IPv6 Networking support...])
dnl Start of checking for IPv6 support...

AC_ARG_ENABLE(ipv6,
  [  --disable-ipv6          Disable IPv6 support in APR.],
  [ if test "$enableval" = "no"; then
        user_disabled_ipv6=1
    fi ],
  [ user_disabled_ipv6=0 ] )

case $host in
  *)
    broken_ipv6=0
esac

AC_SEARCH_LIBS(getaddrinfo, socket inet6)
AC_SEARCH_LIBS(gai_strerror, socket inet6)
AC_SEARCH_LIBS(getnameinfo, socket inet6)
AC_CHECK_FUNCS(gai_strerror)
APR_CHECK_WORKING_GETADDRINFO
APR_CHECK_NEGATIVE_EAI
APR_CHECK_WORKING_GETNAMEINFO
APR_CHECK_SOCKADDR_IN6
APR_CHECK_SOCKADDR_STORAGE
APR_CHECK_SOCKADDR_UN

have_ipv6="0"
if test "$user_disabled_ipv6" = 1; then
    ipv6_result="no -- disabled by user"
else
    if test "x$broken_ipv6" = "x0"; then
        if test "x$have_sockaddr_in6" = "x1"; then
            if test "x$ac_cv_working_getaddrinfo" = "xyes"; then
                if test "x$ac_cv_working_getnameinfo" = "xyes"; then
                    APR_CHECK_GETADDRINFO_ADDRCONFIG
                    have_ipv6="1"
                    ipv6_result="yes"
                else
                    ipv6_result="no -- no getnameinfo"
                fi
            else
                ipv6_result="no -- no working getaddrinfo"
            fi
        else
            ipv6_result="no -- no sockaddr_in6"
        fi
    else
        ipv6_result="no -- the platform has known problems supporting IPv6"
    fi
fi

AC_MSG_CHECKING(if APR supports IPv6)
AC_MSG_RESULT($ipv6_result)

AC_SUBST(have_ipv6)

# hstrerror is only needed if IPv6 is not enabled,
# so getaddrinfo/gai_strerror are not used.
if test $have_ipv6 = 0; then
  AC_SEARCH_LIBS(hstrerror, resolv,
    [AC_DEFINE(HAVE_HSTRERROR, 1, [Define if hstrerror is present])])
fi

dnl Check for langinfo support

AC_CHECK_HEADERS(langinfo.h)
AC_CHECK_FUNCS(nl_langinfo)

dnl ------------------------------ Defaults for some platform nuances

dnl Do we have a Win32-centric Unicode FS?
APR_SETIFNULL(have_unicode_fs, [0])
AC_SUBST(have_unicode_fs)

APR_SETIFNULL(apr_has_xthread_files, [0])
AC_SUBST(apr_has_xthread_files)

APR_SETIFNULL(apr_procattr_user_set_requires_password, [0])
AC_SUBST(apr_procattr_user_set_requires_password)

APR_SETIFNULL(apr_thread_func, [])
AC_SUBST(apr_thread_func)

APR_SETIFNULL(apr_has_user, [1])
AC_SUBST(apr_has_user)

dnl ------------------------------ APR-util stuff 

APU_PRELOAD

dnl Find crypto libraries
APU_CHECK_CRYPTO

dnl Find DBM and DBD backends to use.
APU_CHECK_DBM
APU_CHECK_DBD
APU_CHECK_DBD_MYSQL
APU_CHECK_DBD_SQLITE3
APU_CHECK_DBD_SQLITE2
APU_CHECK_DBD_ORACLE
APU_CHECK_DBD_ODBC

dnl select an XML parser
APU_FIND_XML

dnl Find iconv implementations
APU_FIND_ICONV

dnl Enable DSO build; must be last:
APR_MODULAR_DSO

AC_SEARCH_LIBS(crypt, crypt ufc)
AC_MSG_CHECKING(if system crypt() function is threadsafe)
if test "x$apu_crypt_threadsafe" = "x1"; then
  AC_DEFINE(APU_CRYPT_THREADSAFE, 1, [Define if the system crypt() function is threadsafe])
  msg="yes"
else
  msg="no"
fi
AC_MSG_RESULT([$msg])

AC_CHECK_FUNCS(crypt_r, [ crypt_r="1" ], [ crypt_r="0" ])
if test "$crypt_r" = "1"; then
  APU_CHECK_CRYPT_R_STYLE
fi

APRUTIL_LIBNAME="aprutil${libsuffix}"
AC_SUBST(APRUTIL_LIBNAME)

# Set up destination directory for DSOs.
APR_DSO_LIBDIR="\${libdir}/apr-${APR_MAJOR_VERSION}"
# Set APU_HAVE_MODULES appropriately for the Makefile
if test -n "$APR_DSO_MODULES"; then 
   APR_HAVE_MODULES=yes
else
   APR_HAVE_MODULES=no
fi
APR_EXPAND_VAR(abs_dso_libdir, $APR_DSO_LIBDIR)
AC_DEFINE_UNQUOTED([APR_DSO_LIBDIR], ["$abs_dso_libdir"],
                   [Define to be absolute path to DSO directory])
AC_SUBST(APR_HAVE_MODULES)
AC_SUBST(APR_DSO_LIBDIR)
AC_SUBST(APR_DSO_MODULES)
AC_SUBST(EXTRA_OBJECTS)

dnl XXX FIXME; used for -lexpat, -liconv etc?
AC_SUBST(APRUTIL_EXPORT_LIBS)

dnl
dnl Prep all the flags and stuff for compilation and export to other builds
dnl
APR_ADDTO(LIBS, [$APRUTIL_LIBS])

AC_SUBST(LDFLAGS)


dnl ----------------------------- Finalize the variables

AC_MSG_NOTICE([])
AC_MSG_NOTICE([Restore user-defined environment settings...])

APR_RESTORE_THE_ENVIRONMENT(CPPFLAGS, EXTRA_)
APR_RESTORE_THE_ENVIRONMENT(CFLAGS, EXTRA_)
APR_RESTORE_THE_ENVIRONMENT(LDFLAGS, EXTRA_)
APR_RESTORE_THE_ENVIRONMENT(LIBS, EXTRA_)
APR_RESTORE_THE_ENVIRONMENT(INCLUDES, EXTRA_)
AC_SUBST(NOTEST_CPPFLAGS)
AC_SUBST(NOTEST_CFLAGS)
AC_SUBST(NOTEST_LDFLAGS)
AC_SUBST(NOTEST_LIBS)
AC_SUBST(NOTEST_INCLUDES)

dnl ----------------------------- Construct the files

AC_SUBST(INTERNAL_CPPFLAGS)
AC_SUBST(LDLIBS)
AC_SUBST(INCLUDES)
AC_SUBST(AR)
AC_SUBST(RM)
AC_SUBST(OSDIR)
AC_SUBST(DEFAULT_OSDIR)
AC_SUBST(EXEEXT)
AC_SUBST(LIBTOOL_LIBS)

# Use -no-install or -no-fast-install to link the test 
# programs on all platforms but Darwin, where it would cause
# the programs to be linked against installed versions of
# libapr instead of those just built.
case $host in
    *-apple-darwin*)
        LT_NO_INSTALL=""
        ;;
    *-mingw*)
        LT_NO_INSTALL="-no-fast-install"
        ;;
    *)
        LT_NO_INSTALL="-no-install"
        ;;
esac
AC_SUBST(LT_NO_INSTALL)

#
# BSD/OS (BSDi) needs to use a different include syntax in the Makefiles
#
case $host in
*bsdi*)
    # Check whether they've installed GNU make
    if make --version > /dev/null 2>&1; then 
	INCLUDE_RULES="include $apr_buildout/apr_rules.mk"
	INCLUDE_OUTPUTS="include $apr_srcdir/build-outputs.mk"
    else
	# BSDi make
	INCLUDE_RULES=".include \"$apr_buildout/apr_rules.mk\""
	INCLUDE_OUTPUTS=".include \"$apr_srcdir/build-outputs.mk\""
    fi
    ;;
*)
    INCLUDE_RULES="include $apr_buildout/apr_rules.mk"
    INCLUDE_OUTPUTS="include $apr_srcdir/build-outputs.mk"
    ;;
esac
AC_SUBST(INCLUDE_RULES)
AC_SUBST(INCLUDE_OUTPUTS)

AC_CONFIG_FILES([Makefile
                 include/apr.h
                 build/apr_rules.mk
                 build/pkg/pkginfo
                 apr-$APR_MAJOR_VERSION-config:apr-config.in
                 apr.pc])

if test -d $srcdir/test; then
   AC_CONFIG_FILES([test/Makefile test/internal/Makefile])
fi

AC_CONFIG_FILES([include/private/apu_select_dbm.h
                 include/apu_want.h])

dir=include/arch/unix
test -d $dir || $MKDIR $dir

AC_CONFIG_COMMANDS([default], [
# Commands run at the end of config.status:
for i in $APR_SAVE_HEADERS; do
  if cmp -s $i $i.save 2>/dev/null; then
    mv $i.save $i
    AC_MSG_NOTICE([$i is unchanged])
  fi
  rm -f $i.save
done
chmod +x apr-$APR_MAJOR_VERSION-config
],[
dnl This section is expanded by configure UNQUOTED so variable 
dnl references must be backslash-escaped as necessary.

# Commands run at the beginning of config.status:
APR_SAVE_HEADERS="include/apr.h include/arch/unix/apr_private.h"
APR_MAJOR_VERSION=$APR_MAJOR_VERSION
APR_PLATFORM=$host

for apri in \${APR_SAVE_HEADERS}; do
  test -r \${apri} && mv \${apri} \${apri}.save
done
])

AC_OUTPUT