Until mruby's https://github.com/mruby/mruby/wiki/Building-mruby wiki
page gets some more content, here's a couple intro posts on using CMake.

  http://jonforums.github.com/ruby/2012/05/09/cmake-prototype-for-mruby.html

  http://jonforums.github.com/ruby/2012/05/13/cross-compiling-mruby.html

Jon

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