On Fri, May 18, 2007 at 03:07:30PM -0400, Steven M. Bellovin wrote: > cc1: error: unrecognized command line option "-mcpu=pentiumpro" For GCC 3.3 (?) and later this was changed to -mtune=pentiumpro. If someone is willing to dig out the exact version, we can translate it automatically to -mtune and vice versa. Joerg