Updating the Homebrew formula for geos, when Mac OS X Lion complains about LLVM / gcc-4.2

geos

require 'formula'                                                                                                                                                                  
  
  class Geos < Formula
    url 'http://download.osgeo.org/geos/geos-3.3.1.tar.bz2'
    homepage 'http://trac.osgeo.org/geos/'
    md5 'b1ceefe205c9ee520b99f2b072c345f7'
  
    def skip_clean? path
      path.extname == '.la'
    end
  
    fails_with_llvm "Some symbols are missing during link step."
  
    def install
      ENV.O3
      # Force CLang instead of LLVM-GCC on Lion:
      # http://trac.osgeo.org/geos/ticket/463
      ENV.clang if MacOS.lion?
      system "./configure", "--prefix=#{prefix}", "--disable-debug", "--disable-dependency-tracking"
      system "make install"
    end
 end
      

geos-homebrew

If installing PostGIS or GEOS fails with a complain about LLVM / gcc-4.2, then you may need to update the recipe for home-brew's geos. 

`brew edit geos`

Then paste the contents of the file below into the editor.