Compilation in OSX

[danyaljj]

I had to go through these steps to be able to compile in my Mac, which has gcc 4.2 by default.
Thought it would be worth sharing.

First install gcc49, but this is not gonna change the default behavior:

brew install gcc49 

In command-line, create aliases for gcc 4.9:

export CC=/usr/local/bin/gcc-4.9
export CXX=/usr/local/bin/g++-4.9
export CPP=/usr/local/bin/cpp-4.9
export LD=/usr/local/bin/gcc-4.9
alias c++=/usr/local/bin/c++-4.9
alias g++=/usr/local/bin/g++-4.9
alias gcc=/usr/local/bin/gcc-4.9
alias cpp=/usr/local/bin/cpp-4.9
alias ld=/usr/local/bin/gcc-4.9
alias cc=/usr/local/bin/gcc-4.9

[dmcc]

Thanks! I've linked to this issue from the README (though perhaps you'd be interested in incorporating it into the official docs as README-OSX.rst -- if so, please send a PR).