Rakefile in national_grid-0.1.1 vs Rakefile in national_grid-0.1.2

@@ -3,18 +3,12 @@
 require "rake/testtask"
 require_relative "ext/ostn02c"
 
 CLEAN.include OSTN02C.object_path
 
-file OSTN02C.library => OSTN02C.sources do
-  OSTN02C.make or fail "Building libostn02 failed"
-end
-
 Rake::ExtensionTask.new "national_grid" do |ext|
   ext.lib_dir = "lib/national_grid"
 end
-
-Rake::Task["compile"].prerequisites.unshift FileList[OSTN02C.library]
 
 Rake::TestTask.new "test" => "compile" do |test|
   test.pattern = "test/**/*_test.rb"
 end