Homebrew Pig 0.12.x with Hadoop 2.4

pig.rb

# If you installed Hadoop and Pig with Homebrew on OS X, then get this error:
#
# ERROR org.apache.hadoop.mapreduce.lib.jobcontrol.JobControl - Error whiletrying to run jobs.java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected.
#
# Then this formula is for you.   It downloads pig src, then builds it for >Hadoop 2.3
#
# 

require 'formula'

class Pig < Formula
  homepage 'http://pig.apache.org/'
  url 'http://www.apache.org/dyn/closer.cgi?path=pig/pig-0.12.0/pig-0.12.0-src.tar.gz'
  sha1 '2700daafeccd8cd5612366dbd66acfb30486aa24'

  patch :DATA

  def install
    system 'ant clean jar-all -Dhadoopversion=23' 
    system 'cp build/*.jar .'
    system '(cd contrib/piggybank/java; ant clean jar)'
    system 'cp contrib/piggybank/java/piggybank.jar .'
    bin.install 'bin/pig'
    prefix.install ["pig-0.12.1-SNAPSHOT.jar", "pig-0.12.1-SNAPSHOT-withouthadoop.jar", "piggybank.jar"]
  end

  def caveats; <<-EOS.undent
    You may need to set JAVA_HOME:
      export JAVA_HOME="$(/usr/libexec/java_home)"
    EOS
  end
end

# There's something weird with Pig's launch script, it doesn't find the correct
# path. This patch finds PIG_HOME from the pig binary path's symlink.
__END__
diff -u a/bin/pig b/bin/pig
--- a/bin/pig 2011-09-30 08:55:58.000000000 +1000
+++ b/bin/pig 2011-11-28 11:18:36.000000000 +1100
@@ -55,11 +55,8 @@

 # resolve links - $0 may be a softlink
 this="${BASH_SOURCE-$0}"
-
-# convert relative path to absolute path
-bin=$(cd -P -- "$(dirname -- "$this")">/dev/null && pwd -P)
-script="$(basename -- "$this")"
-this="$bin/$script"
+here=$(dirname $this)
+this="$here"/$(readlink $this)

 # the root of the Pig installation
 export PIG_HOME=`dirname "$this"`/..