It works with this:

~/felix>python3 Python 3.2.3 (v3.2.3:3d0686d90f55, Apr 10 2012, 11:25:50) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin

and also on Linux with this:

skaller@felix:~$ python3 Python 3.2.3 (default, Oct 19 2012, 20:10:41) [GCC 4.6.3] on linux2

I have been told that the script fails if you use a slightly different version of Python:

  File "/usr/lib/python3.3/subprocess.py", line 906, in communicate

So it is an incompatibility in Python 3.3 subprocess module I think.

Indeed, I tried it on a fully up-to-date installation of ArchLinux.

I am sorry about this problem. I have had a look and I understand what is happening but not how to fix it. Python 3.2 does not provide a timeout in the subprocess module. fbuild is using a module by Peter Astrand which derived a new class and adds a timeout. Unfortunately Python 3.3 adds the exact same argument to the API, but defaults it no None, which is clobbering the value used in the derived class somehow, leading to timeout of None being added to a floating point value.