You can install cmake via:

before_install:

  - brew update
  - brew install cmake

Given that it compiles from source, you may want to download a binary instead:

before_install:

  - wget http://www.cmake.org/files/v2.8/cmake-2.8.12.2-Darwin64-universal.tar.gz && tar xfz cmake-2.8.12.2-Darwin64-universal.tar.gz
  - export PATH="`pwd`/cmake-2.8.12.2-Darwin64-universal/CMake 2.8-12.app/Contents/bin":$PATH:
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