diff -urN libxdiff.orig/xinclude.h libxdiff/xinclude.h
--- libxdiff.orig/xinclude.h	2008-11-12 21:29:12 +0000
+++ libxdiff/xinclude.h	2011-01-04 10:57:29 +0000
@@ -23,6 +23,9 @@
 #if !defined(XINCLUDE_H)
 #define XINCLUDE_H
 
+#if defined(HAVE_HBCONFIG_H)
+#include "_hbconf.h"
+#endif /* #if defined(HAVE_HBCONFIG_H) */
 
 #if defined(HAVE_WINCONFIG_H)
 #include "winconfig.h"