If you received distcc from Apple, then you according to the GPL they
must either have given you the source as well, or have given you
a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange
Did you? If you got neither of these, Apple are violating the licence.
You can download it here:
http://www.opensource.apple.com/darwinsource/tarballs/other/distcc-17.tar.gz
All of apple's open-source stuff can be downloaded from there.
I'd posted about it a few months ago (with a link even):
http://lists.samba.org/archive/distcc/2003q4/001771.html
The changes are significant enough that I (not being much of a coder) wasn't able to merge things nicely forward.
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