Then you can check which one that is set, and change back and forth using: sudo update-alternatives -config gcc
Sudo update-alternatives -install /usr/bin/gcc gcc /usr/bin/gcc-4.8 60 -slave /usr/bin/g++ g++ /usr/bin/g++-4.8 But, at this point gcc-4.9 will be your only version configured in update-alternatives, so add 4.8 to update-alternatives, so there actually is an alternative, by using: sudo apt-get install gcc-4.8 g++-4.8 The -slave, with g++, will cause g++ to be switched along with gcc, to the same version. Sudo update-alternatives -install /usr/bin/gcc gcc /usr/bin/gcc-4.9 60 -slave /usr/bin/g++ g++ /usr/bin/g++-4.9 The best way to correctly install gcc-4.9 and set it as your default gcc version use: sudo add-apt-repository ppa:ubuntu-toolchain-r/test
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