diff -r ecc46d56964a build.xml
--- a/build.xml	Tue Apr 14 21:35:05 2015 +0200
+++ b/build.xml	Wed Apr 15 11:17:01 2015 -0400
@@ -352,6 +352,9 @@
             -->
             <arg line="clone http://hg.python.org/jython ${checkout.dir}/${hg.code.dir}"/>
         </exec>
+        <exec executable="hg">
+            <arg line="clone http://hg.python.org/cpython ${checkout.dir}/python"/>
+        </exec>
     </target>
 
     <target name="check-hg">