diff --git a/Rakefile b/Rakefile
index 81e15f2..5ffae80 100644
--- a/Rakefile
+++ b/Rakefile
@@ -4,6 +4,10 @@ $: << 'lib'
 
 require 'rubygems'
 require 'hoe'
+
+deps = %w(ParseTree RubyInline ruby2ruby ZenTest)
+$:.push(*deps.map { |p| "../../#{p}/dev/lib" })
+
 require './lib/heckle.rb'
 
 Hoe.new('heckle', Heckle::VERSION) do |p|
@@ -19,4 +23,6 @@ Hoe.new('heckle', Heckle::VERSION) do |p|
   p.extra_deps << ['ZenTest', '>= 3.5.2']
 end
 
+Hoe::RUBY_FLAGS.sub! /-I/, "-I#{deps.map { |p| "../../#{p}/dev/lib" }.join(":")}:"
+
 # vim: syntax=Ruby
diff --git a/lib/heckle.rb b/lib/heckle.rb
index ecff491..c414095 100644
--- a/lib/heckle.rb
+++ b/lib/heckle.rb
@@ -1,5 +1,6 @@
 require 'rubygems'
 require 'parse_tree'
+require 'sexp_processor'
 require 'unified_ruby'
 require 'ruby2ruby'
 require 'timeout'