brew not linking gcc after install?
The executables are named gcc-4.9 and not gcc
I fixed it by going to:

$&gt;cd /usr/local/Cellar/gcc49/4.9.3/bin
$&gt;ln -s gcc-4.9 gcc
$&gt;ln -s g++-4.9 g++
$&gt; cd ~
$&gt;brew link gcc