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I'm getting an error when trying to install oily_png on OSX:
Note the error: clang: error: unknown argument: '-multiply_definedsuppress' [-Wunused-command-line-argument-hard-error-in-future].
According to this Stack Overflow question, it's a problem with building with XCode 5.1+ installed. I'm not sure if this is something you can fix (I don't see that code in this project), but I wanted to make you aware of it.