mxcl/homebrew — pull request #21255 by danieletorelli (2013-07-16 09:21:22+00:00)
Title: qt5.rb: add libpng include rule on mountain lion

This allow compiler to link against default `libpng` library on MacOS < 10.8 and against Homebrew's `libpng` on MacOS >= 10.8.

Fixes #21254.