diff --git a/ChangeLog b/ChangeLog
index c49f65cb..970e9da3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,8 @@
 
 	* xml.m4: New file to check for libxml.
 
+	* acconfig.h (HAVE_LIBXML): Define this if we have libxml.
+
 	* configure.in: Call `LIBGTOP_XML_HOOK' from `xml.m4' and
 	add libxml libraries to `LIBGTOP_EXTRA_LIBS' when found.
 
diff --git a/acconfig.h b/acconfig.h
index 3764360a..15752af1 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -169,3 +169,7 @@
 
 /* Define if you have the <sys/procfs.h> header file */
 #undef HAVE_SYS_PROCFS_H
+
+/* Define if you have the libxml library */
+#undef HAVE_LIBXML
+
diff --git a/xml.m4 b/xml.m4
index 3026db9b..355d31c4 100644
--- a/xml.m4
+++ b/xml.m4
@@ -20,6 +20,7 @@ AC_DEFUN([LIBGTOP_XML_HOOK],[
 		AC_CHECK_LIB(xml, xmlNewDoc, [
 			$1
 			LIBGTOP_XML_LIB=`$XML_CONFIG --libs`
+			AC_DEFINE(HAVE_LIBXML)
 		], [
 			if test x$2 = xfailure; then 
 				AC_MSG_ERROR(Could not link sample xml program)