message: Roll back modification.
  This shall be done in master.
diff: @@ -9,32 +9,32 @@ matrix:
  include:
  # A. Mac OSX
  - os: osx
  - osx_image: xcode10.2
  + osx_image: xcode9.4
  compiler: clang
  env:
  # 1. Only examples and associated tests
  - CMAKE_EXAMPLE='ON' CMAKE_TEST='OFF' CMAKE_UTILITIES='OFF' CMAKE_PYTHON='OFF' MAKE_TARGET='test'
  - os: osx
  - osx_image: xcode10.2
  + osx_image: xcode9.4
  compiler: clang
  env:
  # 2. Only unitary tests
  - CMAKE_EXAMPLE='OFF' CMAKE_TEST='ON' CMAKE_UTILITIES='OFF' CMAKE_PYTHON='OFF' MAKE_TARGET='test'
  - os: osx
  - osx_image: xcode10.2
  + osx_image: xcode9.4
  compiler: clang
  env:
  # 3. Only utilities and associated tests
  - CMAKE_EXAMPLE='OFF' CMAKE_TEST='OFF' CMAKE_UTILITIES='ON' CMAKE_PYTHON='OFF' MAKE_TARGET='test'
  - os: osx
  - osx_image: xcode10.2
  + osx_image: xcode9.4
  compiler: clang
  env:
  # 4. Only doxygen documentation
  - CMAKE_EXAMPLE='OFF' CMAKE_TEST='OFF' CMAKE_UTILITIES='OFF' CMAKE_PYTHON='OFF' MAKE_TARGET='doxygen'
  # Issue with sphinx-build with sphinx 2.0.1
  # - os: osx
  - # osx_image: xcode10.2
  + # osx_image: xcode9.4
  # compiler: clang
  # env:
  # # 5. Only Python, associated tests and sphinx documentation
  @@ -43,7 +43,6 @@ matrix:
  cache:
  directories:
  - $HOME/.cache/pip
  - - $HOME/Library/Caches/Homebrew
  addons:
  homebrew:
  @@ -59,9 +58,6 @@ addons:
  - cgal
  - python3
  -before_cache:
  - - brew cleanup
  -
  # When installing through libcgal-dev apt, CMake Error at CGAL Exports.cmake The imported target "CGAL::CGAL Qt5" references the file
  install:
  - python3 -m pip install --upgrade pip setuptools wheel
  