From 6a5e1ac9698193b58dbb37930be361e73cbcba0a Mon Sep 17 00:00:00 2001
From: Jack Moffitt <jack@metajack.im>
Date: Fri, 29 Mar 2013 09:47:14 -0600
Subject: [PATCH] Added support for detecting system libxml2.

---
 configure.ac | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 97444e5..e4f9299 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,8 +15,15 @@ AC_ARG_WITH([libxml2],
 
 if test "x$with_libxml2" != xno; then
   PKG_CHECK_MODULES([libxml2], [libxml-2.0 >= 2.7],
-                    [with_libxml2=yes],
+                    [with_libxml2=yes], [dummy=1])
+  if test "x$with_libxml2" != yes; then
+    old_CFLAGS=$CFLAGS
+    CFLAGS="-I /usr/include/libxml2"
+    AC_CHECK_HEADER([libxml/parser.h],
+                    [with_libxml2=yes; libxml2_CFLAGS="-I /usr/include/libxml2"; libxml2_LIBS="-lxml2"],
                     [AC_MSG_ERROR([couldn't find libxml2])])
+    CFLAGS=$old_CFLAGS
+  fi
 else
   AC_CHECK_HEADER(expat.h, [], [AC_MSG_ERROR([couldn't find expat headers; expat required])])
 fi