New formula libass

Libass is a portable subtitle renderer for the ASS/SSA (Advanced Substation
Alpha/Substation Alpha) subtitle format.

Formula/libass.rb

@@ -0,0 +1,14 @@
+require 'formula'
+
+class Libass <Formula
+  url 'http://libass.googlecode.com/files/libass-0.9.9.tar.bz2'
+  homepage 'http://code.google.com/p/libass/'
+  md5 '6f545089d838d524c4f3b12e8ef6ed38'
+
+  depends_on 'pkg-config'
+
+  def install
+    system "./configure", "--disable-debug", "--disable-dependency-tracking", "--prefix=#{prefix}"
+    system "make install"
+  end
+end