diff --git a/ext/libv8/builder.rb b/ext/libv8/builder.rb
old mode 100755
new mode 100644
diff --git a/ext/libv8/checkout.rb b/ext/libv8/checkout.rb
deleted file mode 100644
index 71a5308..0000000
--- a/ext/libv8/checkout.rb
+++ /dev/null
@@ -1,48 +0,0 @@
-require File.expand_path '../../../lib/libv8/version.rb', __FILE__
-
-module Libv8
-  module Checkout
-    module_function
-
-    GYP_SVN = 'http://gyp.googlecode.com/svn'
-    V8_Source = File.expand_path '../../../vendor/v8', __FILE__
-    GYP_Source = File.expand_path '../../../vendor/gyp', __FILE__
-
-    def checkout!
-      # When compiling from a source gem, it's not a git repository anymore and
-      # we assume the right code is already checked out.
-      return unless git?(V8_Source)
-
-      Dir.chdir(V8_Source) do
-        `git fetch`
-        `git checkout #{Libv8::VERSION.gsub(/\.\d+$/,'')} -f`
-        `rm -f .applied_patches`
-      end
-
-      return unless git?(GYP_Source)
-
-      check_git_svn!
-
-      Dir.chdir(GYP_Source) do
-        mkf = File.readlines(File.join(V8_Source, 'Makefile'))
-        idx = mkf.index {|l| l =~ /#{GYP_SVN}/} + 1
-        rev = /--revision (\d+)/.match(mkf[idx])[1]
-        `git fetch`
-        # --git-dir is needed for older versions of git and git-svn
-        `git --git-dir=../../.git/modules/vendor/gyp/ svn init #{GYP_SVN} -Ttrunk`
-        `git config --replace-all svn-remote.svn.fetch trunk:refs/remotes/origin/master`
-        `git checkout $(git --git-dir=../../.git/modules/vendor/gyp/ svn find-rev r#{rev} | tail -n 1) -f`
-      end
-    end
-
-    def git?(dir)
-      File.exists?(File.join(dir, '.git'))
-    end
-
-    def check_git_svn!
-      unless system 'git help svn 2>&1 > /dev/null'
-        fail "git-svn not installed!\nPlease install git-svn."
-      end
-    end
-  end
-end
diff --git a/ext/libv8/compiler.rb b/ext/libv8/compiler.rb
old mode 100755
new mode 100644