http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49137 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-12-16 00:35:49 UTC --- Hmm, I already have gmp and mpfr already installed but I also use the sources inside the source directory, it works for me and uses the newly compiled ones too.