gettext: use options dsl

Formula/gettext.rb

@@ -12,18 +12,14 @@ class Gettext < Formula
     sha1 'c75fdb192f1b49c9e7e2039c66e24f60f26bc027' => :lion
   end
 
-  def options
-  [
-    ['--with-examples', 'Keep example files.'],
-    ['--universal', 'Build universal binaries.']
-  ]
-  end
+  option :universal
+  option 'with-examples', 'Keep example files'
 
   def patches
     # Patch to allow building with Xcode 4; safe for any compiler.
     p = {:p0 => ['https://trac.macports.org/export/79617/trunk/dports/devel/gettext/files/stpncpy.patch']}
 
-    unless ARGV.include? '--with-examples'
+    unless build.include? 'with-examples'
       # Use a MacPorts patch to disable building examples at all,
       # rather than build them and remove them afterwards.
       p[:p0] << 'https://trac.macports.org/export/79183/trunk/dports/devel/gettext/files/patch-gettext-tools-Makefile.in'
@@ -34,7 +30,7 @@ class Gettext < Formula
 
   def install
     ENV.libxml2
-    ENV.universal_binary if ARGV.build_universal?
+    ENV.universal_binary if build.universal?
 
     system "./configure", "--disable-dependency-tracking", "--disable-debug",
                           "--prefix=#{prefix}",