Julia @ Ubuntu 12.04

Julia has some issues when I compiled in Ubuntu 12.04. I modify a little on top of http://ubuntuhandbook.org/index.php/2013/08/install-gcc-4-8-via-ppa-in-ubuntu-12-04-13-04/

1.)  at terminals

sudo add-apt-repository ppa:ubuntu-toolchain-r/test

2.) Then install gcc 4.8,  g++ 4.8, gfortran-4.8

sudo apt-get update; sudo apt-get install gcc-4.8 g++-4.8 gfortran-4.8

3.) Once installed, run following commands one by one to use gcc 4.8 instead of previous version.

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 20
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 20
sudo update-alternatives --install /usr/bin/gfortran gfortran /usr/bin/gfortran-4.8 20

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