I'm still new to darwinbuild and running into a problem that I don't understand. It appears that I have the problem discussed and resolve in this trac ticket: http://darwinbuild.macosforge.org/trac/ticket/ 58 . I have a build root using 9G55 and can even see the correct CarbonHeaders in the 9G55.plist file: CarbonHeaders = { version = 9G55; }; Unfortunately, references to stdlib.h and stat.h are causing errors referring to Availability.h and I'm not sure what might be going on or how I might be able to fix it: In file included from /SourceCache/ppp/ppp-314.0.1/Helpers/pppd/ccp.c: 60: /usr/include/stdlib.h:61:26: error: Availability.h: No such file or directory In file included from /SourceCache/ppp/ppp-314.0.1/Helpers/pppd/ccp.c: 60: /usr/include/stdlib.h:283: error: syntax error before '__OSX_AVAILABLE_BUT_DEPRECATED' Can anyone provide guidance on how to solve this problem? Thanks, Craig