Oh FFS, try latest macOS image to see if it can install gcc.

I would like to say that I don't own a mac, or have physical access to a mac
of any kind.  My only interaction with the mac ecosystem is through the
travis-ci build interface.  Having said that... based solely on the experience
I've had with this build system... I HATE MACS.  With a passion.  They are
overhyped pieces of shit made by idiots who favour shiny things over any sane
design principles.  These machines should not exist.

.travis.yml

@@ -3,13 +3,11 @@ sudo: false
 matrix:
   include:
     - os: osx
-      # Build for macOS 10.11
-      osx_image: xcode7.3
       language: generic
 
 before_install:
   - echo $TRAVIS_OS_NAME
-  - brew update && brew upgrade && brew install gcc
+  - brew install gcc
   - python --version # just to check
   - uname -a
   - pip install --upgrade pip setuptools wheel