/Developer/Tools/Rez -d __DARWIN__ -t APPL -d __WXMAC__ -o $(<target>_OUTPUT_FILE) Carbon.r
/Developer/Tools/Rez -d __DARWIN__ -t APPL -d __WXMAC__ -o $(DEBUG_OUTPUT_FILE) Carbon.r
or
/Developer/Tools/Rez -d __DARWIN__ -t APPL -d __WXMAC__ -o $(RELEASE_OUTPUT_FILE) Carbon.r
This is now Bug #10747:
http://developer.berlios.de/bugs/?func=detailbug&bug_id=10747&group_id=5358
This is so that you can run /usr/local/bin/codeblocks from the command line,