diff --git a/axiom/configure.ac b/axiom/configure.ac
index a952199..8ffa13c 100644
--- a/axiom/configure.ac
+++ b/axiom/configure.ac
@@ -66,6 +66,8 @@
     CFLAGS="$CFLAGS -ansi -Wall -Wno-implicit-function-declaration "
 fi
 
+AC_PATH_TOOL(PKGCONFIG, pkg-config)
+
 AC_MSG_CHECKING(whether to set -Werror)
 AC_ARG_ENABLE(werror, [  --disable-werror  do not treat warnings as errors during build],
 [ case "${enableval}" in
diff --git a/configure.ac b/configure.ac
index 057c57e..0557d76 100644
--- a/configure.ac
+++ b/configure.ac
@@ -116,6 +116,8 @@
 dnl AC_FUNC_REALLOC
 #AC_CHECK_FUNCS([memmove])
 
+AC_PATH_TOOL(PKGCONFIG, pkg-config)
+
 AC_MSG_CHECKING(whether to use archive)
 AC_ARG_WITH(archive,
 [  --with-archive[=PATH]      Find the zlib header files in 'PATH'.
diff --git a/neethi/configure.ac b/neethi/configure.ac
index abe069a..c093b7f 100644
--- a/neethi/configure.ac
+++ b/neethi/configure.ac
@@ -50,6 +50,8 @@
     CFLAGS="$CFLAGS -ansi -Wall -Wno-implicit-function-declaration "
 fi
 
+AC_PATH_TOOL(PKGCONFIG, pkg-config)
+
 AC_MSG_CHECKING(whether to set -Werror)
 AC_ARG_ENABLE(werror, [  --disable-werror        do not treat warnings as errors during build],
 [ case "${enableval}" in
diff --git a/tools/tcpmon/configure.ac b/tools/tcpmon/configure.ac
index d5987c5..151f1c9 100644
--- a/tools/tcpmon/configure.ac
+++ b/tools/tcpmon/configure.ac
@@ -52,6 +52,7 @@
 AC_CHECK_LIB(z, inflate)
 dnl AC_CHECK_LIB(cutest, CuTestInit)
 
+AC_PATH_TOOL(PKGCONFIG, pkg-config)
 
 AC_MSG_CHECKING(whether to build tests)
 AC_ARG_ENABLE(tests,