Homebrew formula for my branch of Cmake with Ninja build fixes

cmake.rb

require 'formula'

class NoExpatFramework < Requirement
  def message; <<-EOS.undent
    Detected /Library/Frameworks/expat.framework

    This will be picked up by CMake's build system and likely cause the
    build to fail, trying to link to a 32-bit version of expat.

    You may need to move this file out of the way to compile CMake.
    EOS
  end
  def satisfied?
    not File.exist? "/Library/Frameworks/expat.framework"
  end
end


class Cmake < Formula
  homepage 'http://www.cmake.org/'
  head 'https://github.com/jkp/CMake.git', :branch => 'jkp/next'
 
  depends_on NoExpatFramework.new

  def install
    args = %W[
      --prefix=#{prefix}
      --system-libs
      --no-system-libarchive
      --datadir=/share/cmake
      --docdir=/share/doc/cmake
      --mandir=/share/man
    ]

    system "./bootstrap", *args
    system "make"
    system "make install"
  end

  def test
    system "#{bin}/cmake", "-E", "echo", "testing"
  end
end