rxvt-unicode: use new dsl

Formula/rxvt-unicode.rb

@@ -1,16 +1,13 @@
 require 'formula'
 
 class RxvtUnicode < Formula
-  url 'http://dist.schmorp.de/rxvt-unicode/Attic/rxvt-unicode-9.15.tar.bz2'
   homepage 'http://software.schmorp.de/pkg/rxvt-unicode.html'
+  url 'http://dist.schmorp.de/rxvt-unicode/Attic/rxvt-unicode-9.15.tar.bz2'
   sha1 'e6fdf091860ecb458730dc68b0176f67f207a2f7'
 
-  depends_on 'pkg-config' => :build
+  option "disable-iso14755", "Disable ISO 14775 Shift+Ctrl hotkey"
 
-  fails_with :llvm do
-    build 2336
-    cause "memory fences not defined for your architecture"
-  end
+  depends_on 'pkg-config' => :build
 
   def patches
     # Patch hunks 1 and 2 allow perl support to compile on Intel.
@@ -19,8 +16,9 @@ class RxvtUnicode < Formula
     DATA
   end
 
-  def options
-    [["--disable-iso14755", "Disable ISO 14775 Shift+Ctrl hotkey"]]
+  fails_with :llvm do
+    build 2336
+    cause "memory fences not defined for your architecture"
   end
 
   def install
@@ -33,7 +31,7 @@ class RxvtUnicode < Formula
             "--with-terminfo=/usr/share/terminfo",
             "--enable-smart-resize"]
 
-    args << "--disable-iso14755" if ARGV.include? "--disable-iso14755"
+    args << "--disable-iso14755" if build.include? "disable-iso14755"
 
     system "./configure", *args
     system "make"