message: Install GL on travis
diff: @@ -23,7 +23,9 @@ addons:
  - libxcursor-dev
  - xorg-dev
  script:
  - - cargo build --features "all" -vvv
  - - cargo test --features "all" -vvv
  + - sudo apt install libgl1
  + - sudo apt install libgl1-mesa-dev
  + - cargo build --features "all"
  + - cargo test --features "all"
  - cargo doc --features "all"
  