Download latest version of XCode

Open Terminal Session

enter the following: xcode-select –install

This will prompt you to install the command line developer tools

click install

Download the latest gnu compilers from here latest archive of the GNU compilers

in terminal cd to your downloads folder containing the downloaded file

run the following command: sudo tar xvf gcc-4.9-bin.tar -C /

edit your .bash_profile and add the following entry

export PATH=/usr/local/bin:$PATH

in the terminal enter: xcode-select –switch <path to Xcode.app>