message: travis: try to get the packages right
diff: @@ -21,8 +21,8 @@ matrix:
  sources:
  - ubuntu-toolchain-r-test
  packages:
  - - g++-5
  - gcc-5
  + - g++-5
  - os: linux
  dist: trusty
  sudo: false
  @@ -35,8 +35,8 @@ matrix:
  sources:
  - ubuntu-toolchain-r-test
  packages:
  - - g++-6
  - gcc-6
  + - g++-6
  - os: linux
  dist: trusty
  sudo: false
  @@ -44,9 +44,12 @@ matrix:
  compiler: clang
  addons:
  apt:
  + sources:
  + - llvm-toolchain-precise-3.6
  packages:
  - libc++1
  - libc++-dev
  + - clang-3.6
  - os: linux
  sudo: required
  services:
  