Update just in case
brew update
Install gcc
brew tap homebrew/versions
brew install gcc49
When building with this version, use:
./configure CC=/usr/local/Cellar/gcc49/4.9-20131027/bin/gcc-4.9
Give make flags:
make CFLAGS="-L/usr/local/opt/gmp4/lib -I/usr/local/opt/gmp4/include -L/usr/local/opt/mpfr2/lib -I/usr/local/opt/mpfr2/include -L/usr/local/opt/libmpc08/lib -I/usr/local/opt/libmpc08/include -L/usr/local/opt/isl011/lib -I/usr/local/opt/isl011/include -L/usr/local/opt/cloog018/lib -I/usr/local/opt/cloog018/include -L/usr/local/Cellar/gcc49/4.9-20131027/lib/gcc/x86_64-apple-darwin12.4.0/4.9.0/"
Configure usually sets also some CFLAGS, remember to add them also!