mercurial/scmposix.py

--- a/mercurial/scmposix.py	Mon Sep 29 23:23:44 2014 -0700
+++ b/mercurial/scmposix.py	Thu Sep 04 21:36:35 2014 +0200
@@ -21,7 +21,8 @@
     # old mod_python does not set sys.argv
     if len(getattr(sys, 'argv', [])) > 0:
         p = os.path.dirname(os.path.dirname(sys.argv[0]))
-        path.extend(_rcfiles(os.path.join(p, root)))
+        if p != '/':
+            path.extend(_rcfiles(os.path.join(p, root)))
     path.extend(_rcfiles('/' + root))
     return path