http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52007
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-01-26 10:44:35 UTC --- (In reply to comment #3) > > Now I have ran autoconf and then ./configure. Here is content of config.log > > #/usr/local/bin/autoconf -v > # ./configure Why have you done that? Where in the GCC installation docs does it say to run autoconf? It doesn't, and it explicitly tells you not to run ./configure, and Andrew also told you not to build in the source directory. Read the docs. Building a compiler is not like building other software, don't assume you know how to do it.