use instance hooks provided by hooks instead of changing the gem’s source

middleman-core/lib/middleman-core/application.rb

@@ -33,6 +33,7 @@ module Middleman
 
     # Uses callbacks
     include Hooks
+    include Hooks::InstanceHooks
 
     # Before request hook
     define_hook :before
@@ -240,5 +241,11 @@ module Middleman
     end
     alias :inspect :to_s # Ruby 2.0 calls inspect for NoMethodError instead of to_s
 
+    # Hooks clones _hooks from the class to the instance.
+    # https://github.com/apotonick/hooks/blob/master/lib/hooks/instance_hooks.rb#L10
+    # Middleman expects the same list of hooks for class and instance hooks:
+    def _hooks
+      self.class._hooks
+    end
   end
 end

middleman-core/lib/middleman-more/core_extensions/compass.rb

@@ -49,7 +49,7 @@ class Middleman::CoreExtensions::Compass < ::Middleman::Extension
     end
 
     # Call hook
-    app.run_hook :compass_config, ::Compass.configuration
+    app.run_hook_for :compass_config, app, ::Compass.configuration
 
     # Tell Tilt to use it as well (for inline sass blocks)
     ::Tilt.register 'sass', CompassSassTemplate

middleman-core/lib/vendored-middleman-deps/hooks-0.3.3/lib/hooks.rb

@@ -77,11 +77,6 @@ module Hooks
     end
 
     def define_hook_writer(name)
-      self.send(:define_method, name.to_sym) do |&block|
-        if self.class.respond_to?(name)
-          self.class.send(name.to_sym, &block)
-        end
-      end
       instance_eval *hook_writer_args(name)
     end