diff -r fc24c10424d2 -r bdd248666dbc mercurial/commands.py
--- a/mercurial/commands.py	Sat Aug 04 07:14:40 2012 +0200
+++ b/mercurial/commands.py	Mon Aug 06 12:59:47 2012 +0200
@@ -1998,6 +1998,10 @@
         ui.write(_(" (check that your locale is properly set)\n"))
         problems += 1
 
+    # Python lib
+    ui.status(_("checking Python lib (%s)...\n")
+              % os.path.dirname(os.__file__))
+
     # compiled modules
     ui.status(_("checking installed modules (%s)...\n")
               % os.path.dirname(__file__))