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# Link gcc and g++ versions first (versions must be installed before)
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-3.4 40 --slave /usr/bin/g++ g++ /usr/bin/g++-3.4

# Set the version to be used
sudo update-alternatives --config gcc

# sudo update-alternatives --config gcc
# There are 2 choices for the alternative gcc (providing /usr/bin/gcc).
# 
# Selection    Path              Priority   Status
# ------------------------------------------------------------
#   * 0            /usr/bin/gcc-4.8   60        auto mode
#     1            /usr/bin/gcc-3.4   40        manual mode
#     2            /usr/bin/gcc-4.8   60        manual mode
# 
# Press enter to keep the current choice[*], or type selection number: