sudo apt-get remove gcc g++ Check gcc again: gcc –version Install gcc 4.9/g++ 4.9 sudo apt-get install gcc-4.9 g++-4.9 Checking Version: g++-4.9 –version Link to gcc g++ ln -s /usr/bin/g++-4.9 /usr/bin/g++ ln -s /usr/bin/gcc-4.9 /usr/bin/gcc Checking Version: g++ –v gcc –v Latest update: mkdir ~/Downloads/gcc-4.9-deb && cd ~/Downloads/gcc-4.9-deb wget http://launchpadlibrarian.net/247707088/libmpfr4_3.1.4-1_amd64.deb wget http://launchpadlibrarian.net/253728424/libasan1_4.9.3-13ubuntu2_amd64.deb wget http://launchpadlibrarian.net/253728426/libgcc-4.9-dev_4.9.3-13ubuntu2_amd64.deb wget […]