Install GCC

install-gcc.sh

#!/bin/bash

# this script installs GCC <4.9.3>
# to use it navigate to your home directory and type:
# sh install-gcc-4.9.3.sh


# set what you want it build with
export CC=gcc-4.8
export CXX=g++-4.8

# download and install gcc 4.9.3
wget https://ftp.gnu.org/gnu/gcc/gcc-4.9.3/gcc-4.9.3.tar.gz
tar xzf gcc-4.9.3.tar.gz
cd gcc-4.9.3
./contrib/download_prerequisites
cd ..
mkdir objdir

cd objdir
make distclean 
../gcc-4.9.3/configure --prefix=$HOME/gcc-4.9.3 --enable-languages=c,c++,fortran,go --disable-multilib
make

# install
make install

# clean up
rm -rf ~/objdir
rm -f ~/gcc-4.9.3.tar.gz

# add to path (you may want to add these lines to $HOME/.bash_profile)
export PATH=$HOME/gcc-4.9.3/bin:$PATH
export LD_LIBRARY_PATH=$HOME/gcc-4.9.3/lib:$HOME/gcc-4.9.3/lib64:$LD_LIBRARY_PATH