Add PACKAGE_URL to config.h.in
diff --git a/config.h.in b/config.h.in
index 8263c08..f44c8ed 100644
--- a/config.h.in
+++ b/config.h.in
@@ -117,6 +117,9 @@
 /* Define to the one symbol short name of this package. */
 #undef PACKAGE_TARNAME
 
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION