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    Installing gcc 4.9 & g++ 4.9 on Ubuntu 12.04 OR Ubuntu 14.04
  
        
  
    
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  | sudo apt-get install python-software-properties | |
| sudo add-apt-repository ppa:ubuntu-toolchain-r/test | |
| sudo apt-get update | |
| sudo apt-get install gcc-4.9 | |
| sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 50 | |
| sudo apt-get install g++-4.9 | |
| sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.9 50 | 
  
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