comment out OSX

.travis.yml

@@ -16,10 +16,11 @@ matrix:
       compiler: clang
       env:
         - MAKETARGET=test-all
-    - os: osx
-      env:
-        - MATRIX_EVAL="brew install gcc && CC=gcc-8 && CXX=g++-8"
-        - MAKETARGET=test-all
+  # This currently appears to be broken.
+  # - os: osx
+  #   env:
+  #     - MATRIX_EVAL="brew install gcc && CC=gcc-8 && CXX=g++-8"
+  #     - MAKETARGET=test-all
 
 before_install:
   - eval "${MATRIX_EVAL}"