diff --git a/NOTICE.txt b/NOTICE.txt
index f12901e..8187a7a 100644
--- a/NOTICE.txt
+++ b/NOTICE.txt
@@ -1,5 +1,5 @@
 Apache Santuario XML-Security-C Library
-Copyright 2010-2018 The Apache Software Foundation
+Copyright 2010-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).
diff --git a/configure.ac b/configure.ac
index ab77e92..acadb72 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,12 +60,7 @@
     CXXFLAGS="-Wall $GCC_CXXFLAGS"
 fi
 
-# pthreads
-AX_PTHREAD
-CFLAGS="${CFLAGS} ${PTHREAD_CFLAGS}"
-CXXFLAGS="${CXXFLAGS} ${PTHREAD_CFLAGS}"
-LIBS="${LIBS} ${PTHREAD_LIBS}"
-CC="${PTHREAD_CC}"
+AX_PTHREAD(,[AC_MSG_ERROR([unable to find pthreads, currently this is required])])
 
 # Check for required includes
 AC_CHECK_HEADERS([unistd.h direct.h])
diff --git a/xml-security-c.pc.in b/xml-security-c.pc.in
index b254803..c7249b0 100644
--- a/xml-security-c.pc.in
+++ b/xml-security-c.pc.in
@@ -7,7 +7,7 @@
 Description: Apache XML security C++ library
 Version: @VERSION@
 Libs: -L${libdir} -lxml-security-c
-Libs.private: @xalan_LIBS@
-Cflags: -I${includedir} @xalan_CXXFLAGS@
+Libs.private: @xalan_LIBS@ @PTHREAD_LIBS@
+Cflags: -I${includedir} @xalan_CXXFLAGS@ @PTHREAD_CFLAGS@
 Requires: @AX_PACKAGE_REQUIRES@
 Requires.private: @AX_PACKAGE_REQUIRES_PRIVATE@
diff --git a/xsec/Makefile.am b/xsec/Makefile.am
index ec5dd90..f222544 100644
--- a/xsec/Makefile.am
+++ b/xsec/Makefile.am
@@ -160,13 +160,15 @@
    $(xalan_CXXFLAGS) \
    $(xerces_CXXFLAGS) \
    $(openssl_CFLAGS) \
-   $(nss_CFLAGS)
+   $(nss_CFLAGS) \
+   $(PTHREAD_CFLAGS)
 
 libxml_security_c_la_LIBADD = \
    $(xalan_LIBS) \
    $(xerces_LIBS) \
    $(openssl_LIBS) \
-   $(nss_LIBS)
+   $(nss_LIBS) \
+   $(PTHREAD_LIBS)
 
 lib_LTLIBRARIES = libxml-security-c.la