kytea: apply patch to stable only

Formula/kytea.rb

@@ -2,8 +2,18 @@ require 'formula'
 
 class Kytea < Formula
   homepage 'http://www.phontron.com/kytea/'
-  url 'http://www.phontron.com/kytea/download/kytea-0.4.6.tar.gz'
-  sha1 '2fb22c64a7babff26d95874877d83a9ef1f09617'
+
+  stable do
+    url 'http://www.phontron.com/kytea/download/kytea-0.4.6.tar.gz'
+    sha1 '2fb22c64a7babff26d95874877d83a9ef1f09617'
+
+    # Upstream patch to fix compilation on OS X
+    patch :p1 do
+      url "https://github.com/neubig/kytea/commit/782553f61bde4f3366f946c9a390500c028fa17f.diff"
+      sha1 "260d62738e53622873b1d467b44576860e5141fe"
+    end
+  end
+
   head do
     url 'https://github.com/neubig/kytea.git', :branch => 'master'
     depends_on 'autoconf' => :build
@@ -11,16 +21,8 @@ class Kytea < Formula
     depends_on 'libtool' => :build
   end
 
-  # Upstream patch to fix compilation on OS X
-  patch :p1 do
-    url "https://github.com/neubig/kytea/commit/782553f61bde4f3366f946c9a390500c028fa17f.diff"
-    sha1 "260d62738e53622873b1d467b44576860e5141fe"
-  end
-
   def install
-    if build.head?
-      system "autoreconf", "-i"
-    end
+    system "autoreconf", "-i" if build.head?
     system "./configure", "--disable-dependency-tracking",
                           "--prefix=#{prefix}"
     system "make install"