I have not been able to successfully get pjsip 1.0.1 to compile under OSX 10.5.6. In fact, it breaks at the "make dep" stage. Configure runs "fine". Make dep generates many #define errors. The make files produced are inoperable. No clues regarding these errors on OSX found elsewhere. I have posted the output from configure, make dep, and make to: http://dl.getdropbox.com/u/71682/pjsip.txt Thanks. Clay