mxcl/homebrew — Issue #8465: pngwriter failed to install
Author: sly9
Created: 2011-11-05 22:01:07+00:00
State: open

Mac OSX 10.7.2, Xcode 4.2 Build 4D199.
https://gist.github.com/1342077

brew doctor tells me: /usr/bin/gcc
Your gcc 4.2.x version is older than the recommended version. It may be advisable
to upgrade to the latest release of Xcode.

but 4.2 is the newest one with XCode...