If the timeout expires before the subprocess exits, the wait method and the
communicate method will raise a subprocess.TimeoutExpired exception.  When used
with communicate, it is possible to catch the exception, kill the process, and
retry the communicate and receive any output written to stdout or stderr.

using GCC 4.0.

Without this patch "./configure --with-pydebug --enable-framework CC=gcc-4.0" fails on MacOSX

Patch by Evan Dandrea.

Some non-compliant MUAs use '.'s, so by the Postel Principle we should
accept them.  Patch by Thomas Herve.

non-semaphore implementation of locks is used under POSIX.