--- a/ant/build.xml
+++ b/ant/build.xml
@@ -149,6 +149,7 @@
                  use="yes"
                  linksource="yes"
                  splitindex="yes">
+	    <link href="/usr/share/doc/default-jdk-doc/api/" />
             <classpath refid="build.classpath" />
             <packageset dir="${basedir}/source" defaultexcludes="yes">
                 <include name="org/jfree/**"/>