couchdb: depend on homebrew/versions/erlang-r15

Formula/couchdb.rb

@@ -1,35 +1,5 @@
 require 'formula'
 
-class Erlang16Incompat < Requirement
-  fatal true
-
-  def version
-    Formula.factory('erlang').version
-  end
-
-  satisfy do
-    version =~ /R(\d{2})B/
-    $1.to_i > 15
-  end
-
-  def message; <<-EOS.undent
-    Erlang <= R15B03-1 is required to install.
-
-    You have a erlang version #{version}
-
-    The work-around is:
-
-        brew unlink erlang
-        cd #{HOMEBREW_REPOSITORY}
-        git checkout 168742f Library/Formula/erlang.rb
-        brew install erlang
-        brew install couchdb
-
-    EOS
-  end
-end
-
-
 class Couchdb < Formula
   homepage "http://couchdb.apache.org/"
   url 'http://www.apache.org/dyn/closer.cgi?path=/couchdb/1.2.1/apache-couchdb-1.2.1.tar.gz'
@@ -37,11 +7,10 @@ class Couchdb < Formula
 
   head 'http://git-wip-us.apache.org/repos/asf/couchdb.git'
 
-  depends_on Erlang16Incompat
   depends_on 'help2man' => :build
   depends_on 'spidermonkey'
   depends_on 'icu4c'
-  depends_on 'erlang'
+  depends_on 'homebrew/versions/erlang-r15'
   depends_on 'curl' if MacOS.version == :leopard
 
   def install