http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55083
--- Comment #6 from Perry Smith <pedzsan at gmail dot com> 2012-12-09 05:40:28 UTC --- If it helps, here are the last messages from the make log: checking for powerpc-ibm-aix6.1.0.0-gcc... /usr/work/build/gcc.git/./gcc/xgcc -B/usr/work/build/gcc.git/./gcc/ -B /gsa/ausgsa/projects/r/ruby/powerpc-ibm-aix6.1.0.0/bin/ -B/gsa/ausgsa/projects/r/ruby/powerpc-ibm-aix6.1.0.0/lib/ -isystem /gsa/ausgsa/projects/r/ruby/powerpc-ibm-aix6.1.0.0/include -isystem /gsa/ausgsa/projects/r/ruby/powerpc -ibm-aix6.1.0.0/sys-include -maix64 checking for C compiler default output file name... configure: error: in `/usr/work/build/gcc.git/powerpc-ibm-aix6.1.0.0/ppc64/libatomic': configure: error: C compiler cannot create executables See `config.log' for more details. make[1]: *** [configure-target-libatomic] Error 1 make[1]: Leaving directory `/usr/work/build/gcc.git' make: *** [all] Error 2 All's I know is after the error, a "make" would not finish the config processing and go down a different path.