Testing test suite of pyth-2.7.
Re-running failed tests in verbose mode
Re-running test 'test_mhlib' in verbose mode
test_basic (test.test_mhlib.MhlibTests) ... ok
test_listfolders (test.test_mhlib.MhlibTests) ... FAIL

It seems to be pinned down to this one line in test that failed.

ok, it comes down to this.  From test_mhlib.py

    def test_listfolders(self):
        mh = getMH()
        eq = self.assertEqual

#        tfolders.sort()                    \\ Line 184
#        eq(folders, tfolders)              \\ Line 185

Commenting them out removes the source of error. The lines that trips up include at least 185, 189, 193.  The 'folders' are not equal.

Bug filed in gentoo bugzilla; Bug 387967; 21-10-2011.

The build log from that bug in Comment 2

https://bugs.gentoo.org/attachment.cgi?id=290409