mxcl/homebrew — pull request #13898 by mikemcquaid (2012-08-02 20:11:18+00:00)
Title: Re-add libpng and freetype rather than depending on X11.

Lion and Mountain Lion don't ship with X11 so we shouldn't
recommend XQuartz just for a simple Qt dependency.

While I was fixing ImageMagick I also tweaked the formula to
make the default options more sensible (e.g. png, jpeg and built-in)
which seems to make sense now options are sticky.

Also related to this is 94cb77 where I tell Qt to use the internal libpng.