lablgtk: add x11 dep

Formula/lablgtk.rb

@@ -1,15 +1,19 @@
 require 'formula'
 
 class Lablgtk < Formula
-  url 'http://wwwfun.kurims.kyoto-u.ac.jp/soft/lsl/dist/lablgtk-2.14.2.tar.gz'
   homepage 'http://wwwfun.kurims.kyoto-u.ac.jp/soft/lsl/lablgtk.html'
-  md5 'bad77680a72dab8b915cae99d1ec9b1f'
+  url 'http://wwwfun.kurims.kyoto-u.ac.jp/soft/lsl/dist/lablgtk-2.14.2.tar.gz'
+  sha1 'fd184418ccbc542825748ca63fba75138d2ea561'
 
+  depends_on :x11
   depends_on 'objective-caml'
   depends_on 'gtk+'
 
   def install
-    system "./configure", "--bindir=#{bin}", "--libdir=#{lib}", "--mandir=#{man}", "--with-libdir=#{lib}/ocaml"
+    system "./configure", "--bindir=#{bin}",
+                          "--libdir=#{lib}",
+                          "--mandir=#{man}",
+                          "--with-libdir=#{lib}/ocaml"
     ENV.j1
     system "make world"
     system "make install"