diff --git a/manual/docbook-en/index.docbook b/manual/docbook-en/index.docbook
index 4dd6c09..452dc86 100755
--- a/manual/docbook-en/index.docbook
+++ b/manual/docbook-en/index.docbook
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "/usr/share/xml/docbook/schema/dtd/4.4/docbookx.dtd" [
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "/usr/share/sgml/docbook/dtd/4.4/docbookx.dtd" [
 
   <!ENTITY appname "QtiPlot">
   <!ENTITY kappname "&appname;">
diff --git a/manual/qtiplot.dsl b/manual/qtiplot.dsl
index 16a160f..a596c2e 100755
--- a/manual/qtiplot.dsl
+++ b/manual/qtiplot.dsl
@@ -6,7 +6,7 @@
 <!DOCTYPE style-sheet PUBLIC "-//James Clark//DTD DSSSL Style Sheet//EN" [
 
 <!-- Path to main Docbook->html stylesheet. You have to adapt this to your installation. -->
-<!ENTITY docbook-html-stylesheet SYSTEM "/usr/share/sgml/docbook/stylesheet/dsssl/modular/html/docbook.dsl" CDATA DSSSL>
+<!ENTITY docbook-html-stylesheet SYSTEM "/usr/share/sgml/stylesheet/dsssl/modular/html/docbook.dsl" CDATA DSSSL>
 
 <!-- Stylesheet function library for creating Windows HTML help and Qt Assistant profiles. -->
 <!ENTITY docbook-help-stylesheet SYSTEM "./help.dsl" CDATA DSSSL>
diff --git a/manual/qtiplot_html.xsl b/manual/qtiplot_html.xsl
index 593bf6f..3f4d31c 100755
--- a/manual/qtiplot_html.xsl
+++ b/manual/qtiplot_html.xsl
@@ -1,5 +1,5 @@
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version='1.0'>
-<xsl:import href="file:////usr/share/xml/docbook/stylesheet/nwalsh/html/chunk.xsl"/>
+<xsl:import href="file:////usr/share/sgml/docbook/xsl-stylesheet/nwalsh/html/chunk.xsl"/>
 
 	<!-- html.stylesheet
 	The html.stylesheet parameter is either empty, indicating that no