2nd chunk removes incomplete chec. Without it autoconf will fail.
================================================================================
--- configure.in
+++ configure.in
@@ -75,7 +75,7 @@
 dnl make CFLAGS very pedantic at least during the devel phase for everybody
 dnl
     if test "${GCC}" = "yes" ; then
-	CFLAGS="-g -O -W -Wformat -Wunused -Wimplicit -Wreturn-type -Wswitch -Wcomment -Wtrigraphs -Wformat -Wchar-subscripts -Wuninitialized -Wparentheses -Wshadow -Wpointer-arith -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Winline -Wredundant-decls -Wall"
+	CFLAGS="-g -O -W -Wformat -Wunused -Wimplicit -Wreturn-type -Wswitch -Wcomment -Wtrigraphs -Wformat -Wchar-subscripts -Wuninitialized -Wparentheses -Wshadow -Wpointer-arith -Wcast-align -Wwrite-strings -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Winline -Wredundant-decls -Wall $CFLAGS"
     fi
 
 dnl
@@ -161,7 +161,7 @@
 if test "z$with_libxml" = "zno" ; then 
     AC_MSG_CHECKING(for libxml2 libraries >= $LIBXML_MIN_VERSION) 
     AC_MSG_ERROR(libxml2 >= $LIBXML_MIN_VERSION is required for $XMLSEC_PACKAGE)
-elif test "z$with_libxml" = "z" -a "z$PKG_CONFIG_ENABLED" = "zyes" ; then
+elif test "z$with_libxml" = "z" ; then
     PKG_CHECK_MODULES(LIBXML, libxml-2.0 >= $LIBXML_MIN_VERSION,
 	[LIBXML_FOUND=yes],
 	[LIBXML_FOUND=no])