message: added highsierra to darwin compilers file.
diff: @@ -11,3 +11,15 @@ compilers:
  f77: /usr/local/bin/gfortran
  fc: /usr/local/bin/gfortran
  spec: clang@7.3.0-apple
  +- compiler:
  + environment: {}
  + extra_rpaths: []
  + flags: {}
  + modules: []
  + operating_system: highsierra
  + paths:
  + cc: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
  + cxx: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
  + f77: /usr/local/bin/gfortran
  + fc: /usr/local/bin/gfortran
  + spec: clang@9.0.0
  