diff -r ab545a15d807 -r 4e7e63fc685a mercurial/posix.py
--- a/mercurial/posix.py	Sat Jul 23 14:33:35 2011 -0500
+++ b/mercurial/posix.py	Sat Jul 23 12:29:52 2011 +0200
@@ -348,3 +348,6 @@
     child process under Windows, unneeded on other systems.
     """
     pass
+
+def executablepath():
+    return None # available on Windows only