Patch for the Homebrew's mysql formula to build it with Percona XtraDB plugin

mysql_xtradb.patch

diff --git a/Library/Formula/mysql.rb b/Library/Formula/mysql.rb
index 1f2ecdc..b6f3c01 100644
--- a/Library/Formula/mysql.rb
+++ b/Library/Formula/mysql.rb
@@ -1,5 +1,11 @@
 require 'formula'
 
+class PerconaXtradb < Formula
+  url 'http://www.percona.com/percona-builds/Percona-Server/Percona-Server-5.1.45-10/source/percona-xtradb-1.0.6-10.tar.gz'
+  md5 'd20bc3befd6e732c40fd41a9adcec9d9'
+  version '1.0.6-10'
+end
+
 class Mysql <Formula
   homepage 'http://dev.mysql.com/doc/refman/5.1/en/'
   url 'http://mysql.llarian.net/Downloads/MySQL-5.1/mysql-5.1.45.tar.gz'
@@ -12,6 +18,7 @@ class Mysql <Formula
       ['--with-tests', "Keep tests when installing."],
       ['--with-bench', "Keep benchmark app when installing."],
       ['--client-only', "Only install client tools, not the server."],
+      ['--with-xtradb', "Replace MySQL InnoDB plugin with Percona XtraDB."],
     ]
   end
 
@@ -44,6 +51,12 @@ class Mysql <Formula
 
     configure_args << "--without-server" if ARGV.include? '--client-only'
 
+    if ARGV.include? '--with-xtradb'
+      `rm -rf storage/innobase/*`
+      mysql_root = Dir.pwd
+      PerconaXtradb.new.brew { `cp -R * #{mysql_root}/storage/innobase` }
+    end
+
     system "./configure", *configure_args
     system "make install"