message: mac build: attempt to force clock update
diff: @@ -7,6 +7,8 @@ dependencies:
  # Cache homebrew and everything it installs.
  - "/usr/local"
  pre:
  + # Some CircleCI OS X hosts have wonky times. Force a time sync.
  + - sudo ntpdate -vu time.apple.com
  - brew ls --versions coreutils >/dev/null || brew install coreutils
  - brew ls --versions wget >/dev/null || brew install wget
  - brew ls --versions cmake >/dev/null || brew install cmake
  