Homebrew/homebrew-dupes — pull request #92 by cdmwebs (2012-09-20 18:39:58+00:00)
Title: Update apple-gcc4.2 for Mountain Lion

````
######################################################################## 100.0%
==> Downloading http://r.research.att.com/tools/gcc-42-5666.3-darwin11.pkg
Already downloaded: /Users/cdmwebs/Library/Caches/Homebrew/apple-gcc42-4.2.1-5666.3.pkg
Error: comparison of Float with :lion failed
````

Changed to 10.7 and it works.