--- doc/manual.xml.head.orig	2019-11-24 03:39:46 UTC
+++ doc/manual.xml.head
@@ -1,6 +1,6 @@
 <?xml version="1.0" standalone="no"?>
 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+  "/usr/local/share/xml/docbook/4.2/docbookx.dtd">
 <book>
 
 <bookinfo>