Add ruby-odbc formula

Formula/ruby-odbc.rb

@@ -0,0 +1,38 @@
+require 'formula'
+
+class RubyOdbc < Formula
+  url 'http://www.ch-werner.de/rubyodbc/ruby-odbc-0.9997.tar.gz'
+  homepage 'http://www.ch-werner.de/rubyodbc/'
+  md5 '36d21519795c3edc8bc63b1ec6682b99'
+
+  depends_on 'unixodbc'
+  depends_on 'freetds'
+
+  def install
+    system "ruby extconf.rb --enable-dlopen --with-odbc-dir=#{HOMEBREW_PREFIX}/lib"
+
+    # extconf.rb assumes it will install ruby-odbc within a folder in your
+    # current ruby installation.
+    #
+    # The following modifications to the Makefile ensure that it is installed
+    # within your homebrew directories.
+    inreplace 'Makefile', /^prefix = .*$/, "prefix = #{prefix}"
+    inreplace 'Makefile', /^sitearchdir = .*$/, "sitearchdir = #{prefix}/lib"
+
+    system 'make'
+    system 'make install'
+  end
+
+  def caveats
+<<EOS
+Installed ruby-odbc into #{prefix}/lib.
+
+You will need to add this to your RUBYLIB by adding the following line to
+.profile or .bashrc or equivalent
+    export RUBYLIB="#{prefix}/lib:$RUBYLIB"
+
+You will need to edit freetds.conf,	odbcinst.ini and odbc.ini files to set up
+access to your odbc databases.
+EOS
+  end
+end