Updated compiler sources, binaries and patches for Mac OS X can be downloaded from http://www.microbizz.nl/gpc.html. Please note that there are separate binary installer packages for Mac OS X 10.3 and Mac OS X 10.4.
The distribution is based on gpc-20050331, gcc-3.4.4 and Waldek's MacPascal (& Delphi) object support patches (delphi14.diff).
Regards,
Adriaan van Os