language: c

os: # Will run on Linux and Mac
  - linux
  - osx

compiler:
  - gcc
  - clang

addons:
  apt:
    packages:
      - graphviz

before_install: # You can use $TRAVIS_OS_NAME to perform OS specific actions.
  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew update          ; fi
  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then apt update; fi