gnu-sed: use options DSL

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/gnu-sed.rb

@@ -1,18 +1,16 @@
 require 'formula'
 
 class GnuSed < Formula
+  homepage 'http://www.gnu.org/software/sed/'
   url 'http://ftpmirror.gnu.org/sed/sed-4.2.1.tar.bz2'
   mirror 'http://ftp.gnu.org/gnu/sed/sed-4.2.1.tar.bz2'
-  homepage 'http://www.gnu.org/software/sed/'
-  md5 '7d310fbd76e01a01115075c1fd3f455a'
+  sha1 'ace93d23eabc00d3a8187ecf07d3a02b1b297810'
 
-  def options
-    [['--default-names', "Do NOT prepend 'g' to the binary; will override system utils."]]
-  end
+  option 'default-names', "Do not prepend 'g' to the binary"
 
   def install
     args = ["--prefix=#{prefix}", "--disable-dependency-tracking"]
-    args << "--program-prefix=g" unless ARGV.include? '--default-names'
+    args << "--program-prefix=g" unless build.include? 'default-names'
 
     system "./configure", *args
     system "make install"