When I enter
brew install gcc49
I see:
Warning: gcc49-4.9.0 already installed
and when I check my gcc version with gcc -v
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin12.5.0
Thread model: posix
Is there something else I have to do besides install gcc49 via homebrew to be able to use it?