diff -urp passenger-release-4.0.18.orig/lib/phusion_passenger/platform_info/depcheck_specs/gems.rb passenger-release-4.0.18/lib/phusion_passenger/platform_info/depcheck_specs/gems.rb
--- passenger-release-4.0.18.orig/lib/phusion_passenger/platform_info/depcheck_specs/gems.rb	2013-09-17 13:47:54.000000000 -0500
+++ passenger-release-4.0.18/lib/phusion_passenger/platform_info/depcheck_specs/gems.rb	2013-09-23 16:27:59.963267382 -0500
@@ -1,11 +1,3 @@
-define 'fastthread' do
-	name 'fastthread'
-	define_checker do
-		check_for_ruby_library('fastthread')
-	end
-	gem_install 'fastthread'
-end
-
 define 'rack' do
 	name 'rack'
 	define_checker do
Only in passenger-release-4.0.18/lib/phusion_passenger/platform_info/depcheck_specs: gems.rb.fastthread