Initial commit of formula for dwdiff.

This adds a formula for dwdiff which is a frontend to diff that operates
at the word level instead of the line level. For more details go to
http://os.ghalkes.nl/dwdiff.html

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/dwdiff.rb

@@ -0,0 +1,22 @@
+require 'formula'
+
+class Dwdiff <Formula
+  url 'http://os.ghalkes.nl/dist/dwdiff-1.8.1.tgz'
+  homepage 'http://os.ghalkes.nl/dwdiff.html'
+  md5 '37971be9e905aa3eeb4d494ad40a6318'
+
+  # TODO: possibly set command line arguments to compile without the below
+  # dependencies. Or set arguments to compile with and compile without by
+  # default.
+  depends_on 'gettext'
+  depends_on 'icu4c'
+
+  def install
+    gettext_prefix = Formula.factory('gettext').prefix
+    icu4c_prefix = Formula.factory('icu4c').prefix
+    ENV.append "CFLAGS", "-I#{gettext_prefix}/include -I#{icu4c_prefix}/include"
+    ENV.append "LDFLAGS", "-L#{gettext_prefix}/lib -L#{icu4c_prefix}/lib"
+    system "./configure", "--prefix=#{prefix}"
+    system "make install"
+  end
+end