tig: HEAD depends on autoconf and automake

Formula/tig.rb

@@ -2,10 +2,15 @@ require 'formula'
 
 class Tig < Formula
   homepage 'http://jonas.nitro.dk/tig/'
-  head 'https://github.com/jonas/tig.git'
   url 'http://jonas.nitro.dk/tig/releases/tig-1.2.1.tar.gz'
   sha1 '5755bae7342debf94ef33973e0eaff6207e623dc'
 
+  head do
+    url "https://github.com/jonas/tig.git"
+    depends_on "autoconf" => :build
+    depends_on "automake" => :build
+  end
+
   option 'with-docs', 'Build man pages using asciidoc and xmlto'
 
   if build.with? "docs"