Add x11 option to emacs

Formula/emacs.rb

@@ -13,6 +13,7 @@ class Emacs <Formula
   def options
     [
       ["--cocoa", "Build a Cocoa version of emacs"],
+      ["--with-x", "Include X11 support"],
       ["--use-git-head", "Use repo.or.cz git mirror for HEAD builds"],
     ]
   end
@@ -74,7 +75,14 @@ class Emacs <Formula
       system "make install"
       prefix.install "nextstep/Emacs.app"
     else
-      configure_args << "--without-x"
+      if ARGV.include? "--with-x"
+        configure_args << "--with-x"
+        configure_args << "--with-gif=no"
+        configure_args << "--with-tiff=no"
+        configure_args << "--with-jpeg=no"
+      else
+        configure_args << "--without-x"
+      end
       system "./configure", *configure_args
       system "make"
       system "make install"