Comment 3 for bug 293130

Here's the output of "cat /usr/lib/pkgconfig/libxml-2.0.pc":
prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
modules=1

Name: libXML
Version: 2.7.5
Description: libXML library version2.
Requires:
Libs: -L${libdir} -lxml2
Libs.private: -lz -lm
Cflags: -I${includedir}/libxml2

You're supposed to use it with:
AC_CHECK_LIB([xml2], [xmlParseFile])
PKG_CHECK_MODULES(XML2, "libxml-2.0")
in your configure.ac file...