On 18 November 2013 00:27, Plamen Peshev wrote: > bond-MacBook:objdir test$ $PWD/../Downloads/gcc-4.8.2/configure -mcpu=i686 > configure: error: unrecognized option: `-mcpu=i686' The manual describes options for using GCC, not configuring it. You should be looking at http://gcc.gnu.org/install/ instead. The configuration section describes the --with-cpu option for use during configuration. > bond-MacBook:bin test$ ./gcc /? > ld: warning: ignoring file /1, file was built for unsupported file GCC does not print help with /?, because ? is a shell wildcard. You probably want "gcc --help" which is the convention on UNIX-like systems where GCC originated. Please let us know if you have suggestions for improving the documentation to help angry people who blame others because they don't understand the tools they're using.