Modify the GCC and g++ versions in Ubuntu

I test the Ubuntu15.10 default is to use gcc5.x, and matlab2014b only gcc4.7 support, modify the version of the GCC and g++ in Ubuntu:

CTRL + ALT + T open terminal, enter:

sudo apt-get update
sudo apt-get install gcc-4.7
sudo apt-get install g++-4.7

GCC--version display version is still 5.x, and did not set version 4.7 as the default GCC link file, enter/usr/bin/to remove gcc This file, set up link to gcc-4.7 (g++ similar):
Cd/usr/bin
sudo rm gcc
sudo ln-s gcc-4.7 g++
sudo rm g++
sudo ln-s g++-4.7 g++

Modify the GCC and g++ versions in Ubuntu