You have to check out the Heidelberg UG from the day your patch file was...

You have to check out the Heidelberg UG from the day your patch file was created on for patching to work...  sighhh...

[[Imported from SVN: r5153]]

doc/contrib-software.wml

@@ -194,6 +194,7 @@ versions of DUNE.  For legal reasons we cannot provide a patched UG directly.
   <li>
         The 1.1 release of DUNE works with the vanilla UG plus a set
         of <a href="http://www.dune-project.org/download/ug-dune-patches-1.1.diff">patches</a>.
+        These patches were created on 2008-03-25.
   </li>
   <li>
         For the current svn version of DUNE you need the latest set of patches, which dates from
@@ -205,8 +206,10 @@ versions of DUNE.  For legal reasons we cannot provide a patched UG directly.
 Here's how you get a patched UG:
 <ul>
   <li>
-    Check out the latest version of UG from the central repository at 
-    <a href="http://sit.iwr.uni-heidelberg.de/~ug">http://sit.iwr.uni-heidelberg.de/~ug</a>.
+    Check out the version of UG from the central repository at 
+    <a href="http://sit.iwr.uni-heidelberg.de/~ug">http://sit.iwr.uni-heidelberg.de/~ug</a>
+    of the day your patch file was created on.  You can do that by using the option
+    <tt>-D MM/DD/YYYY</tt> when checking out the sources.
     UG will appear in a directory called <tt>UG</tt>.
   </li>
   <li>