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-rw-r--r--doc/manual/book.xml4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/manual/book.xml b/doc/manual/book.xml
index 1f54d4efdaed..a2035fca7f1c 100644
--- a/doc/manual/book.xml
+++ b/doc/manual/book.xml
@@ -1,5 +1,7 @@
 <?xml version="1.0"?>
-<!DOCTYPE book SYSTEM "/nix/current/xml/dtd/docbook/docbookx.dtd"
+<!DOCTYPE book
+    PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+    "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
 [
 <!ENTITY introduction SYSTEM "introduction.xml">
 <!ENTITY installation SYSTEM "installation.xml">