I had to modify some parts of the configurations process inwhich the host type is guessed (since there's no support for Darwin) and 2 of the includes to at least give partial pthread support.
Mine does end, but one file (yacc.cc I believe) takes nearly 2.5 hours to compile on my PowerBook.
OK, here's the binary:
http://www.heatware.com/Files/mysql-3.23.24-beta-powerpc-apple-darwin1.2.tar.gz
Please DO NOT TRY THIS unless ALL of you important files are backed up. Although I can tell you I'm not trying to so so, I'm not responsible if this sends your computer into a flaming...