Bash script to enable node-gyp build in Debian/Ubuntu etc. This is needed for every modern NodeJS version.

.travis.yml

before_install:
  - sudo apt-get install python-software-properties
  - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
  - sudo apt-get update
  - sudo apt-get install gcc-5 g++-5
  - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 80 --slave /usr/bin/g++ g++ /usr/bin/g++-5
  - sudo update-alternatives --set gcc /usr/bin/gcc-5

install.sh

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-5 g++-5
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 80 --slave /usr/bin/g++ g++ /usr/bin/g++-5
sudo update-alternatives --config gcc #choose gcc-5 from the list