message: Try something different to get a modern cmake
diff: dist: trusty
  sudo: required
  -matrix:
  - include:
  - - compiler: gcc
  +language:
  + - cpp
  +compiler:
  + - gcc
  addons:
  apt:
  sources:
  - ubuntu-toolchain-r-test
  + - george-edison55-precise-backports
  packages:
  - - g++-4.9
  - env: COMPILER=g++-4.9
  - - compiler: gcc
  - addons:
  - apt:
  - sources:
  - - ubuntu-toolchain-r-test
  - packages:
  - - g++-5
  - env: COMPILER=g++-5
  - - compiler: clang
  - addons:
  - apt:
  - sources:
  - - ubuntu-toolchain-r-test
  - - llvm-toolchain-precise-3.6
  - packages:
  - - clang-3.6
  - env: COMPILER=clang++-3.6
  - - compiler: clang
  - addons:
  - apt:
  - sources:
  - - ubuntu-toolchain-r-test
  - - llvm-toolchain-precise-3.7
  - packages:
  - - clang-3.7
  - env: COMPILER=clang++-3.7
  -
  -before_install:
  - - sudo apt-get update -qq
  - - sudo apt-get install -y libopencv-dev
  + - gcc-6
  + - g++-6
  + - cmake
  + - cmake-data
  + - cmake
  script:
  # Link gcc-6 and g++-6 to their standard commands
  - ln -s /usr/bin/gcc-6 /usr/local/bin/gcc
  