Just do a simple require for sass, haml-edge will have to be loaded by the user explicitly if they want that.

Fall back to loading rubygems to load sass if it cannot be loaded.

lib/compass/dependencies.rb

@@ -1,10 +1,8 @@
 unless defined?(Sass)
-  require 'rubygems'
   begin
-    gem 'haml-edge', '>= 2.3.0'
+    require 'sass'
-    $stderr.puts "Loading haml-edge gem."
+  rescue LoadError
-  rescue Exception
+    require 'rubygems'
-    #pass
-  end
     require 'sass'
   end
+end