Use absolute paths with autoload and require to not depend on load path.

lib/thin.rb

@@ -3,44 +3,44 @@
 require 'stringio'
 require 'time'
 require 'forwardable'
-
 require 'openssl'
 require 'eventmachine'
-
-require 'thin/version'
-require 'thin/statuses'
+require 'rack'
 
 module Thin
-  autoload :Command,            'thin/command'
-  autoload :Connection,         'thin/connection'
-  autoload :Daemonizable,       'thin/daemonizing'
-  autoload :Logging,            'thin/logging'
-  autoload :Headers,            'thin/headers'
-  autoload :Request,            'thin/request'
-  autoload :Response,           'thin/response'
-  autoload :Runner,             'thin/runner'
-  autoload :Server,             'thin/server'
-  autoload :Stats,              'thin/stats'
+  ROOT = File.expand_path(File.dirname(__FILE__))
+
+  autoload :Command,            "#{ROOT}/thin/command"
+  autoload :Connection,         "#{ROOT}/thin/connection"
+  autoload :Daemonizable,       "#{ROOT}/thin/daemonizing"
+  autoload :Logging,            "#{ROOT}/thin/logging"
+  autoload :Headers,            "#{ROOT}/thin/headers"
+  autoload :Request,            "#{ROOT}/thin/request"
+  autoload :Response,           "#{ROOT}/thin/response"
+  autoload :Runner,             "#{ROOT}/thin/runner"
+  autoload :Server,             "#{ROOT}/thin/server"
+  autoload :Stats,              "#{ROOT}/thin/stats"
 
   module Backends
-    autoload :Base,             'thin/backends/base'
-    autoload :SwiftiplyClient,  'thin/backends/swiftiply_client'
-    autoload :TcpServer,        'thin/backends/tcp_server'
-    autoload :UnixServer,       'thin/backends/unix_server'
+    autoload :Base,             "#{ROOT}/thin/backends/base"
+    autoload :SwiftiplyClient,  "#{ROOT}/thin/backends/swiftiply_client"
+    autoload :TcpServer,        "#{ROOT}/thin/backends/tcp_server"
+    autoload :UnixServer,       "#{ROOT}/thin/backends/unix_server"
   end
 
   module Controllers
-    autoload :Cluster,          'thin/controllers/cluster'
-    autoload :Controller,       'thin/controllers/controller'
-    autoload :Service,          'thin/controllers/service'
+    autoload :Cluster,          "#{ROOT}/thin/controllers/cluster"
+    autoload :Controller,       "#{ROOT}/thin/controllers/controller"
+    autoload :Service,          "#{ROOT}/thin/controllers/service"
   end
 end
 
-require 'rack'
-require 'rack/adapter/loader'
+require "#{Thin::ROOT}/thin/version"
+require "#{Thin::ROOT}/thin/statuses"
+require "#{Thin::ROOT}/rack/adapter/loader"
 
 module Rack
   module Adapter
-    autoload :Rails, 'rack/adapter/rails'
+    autoload :Rails, "#{Thin::ROOT}/rack/adapter/rails"
   end
 end

lib/thin/request.rb

@@ -1,4 +1,4 @@
-require 'thin_parser'
+require "#{Thin::ROOT}/thin_parser"
 require 'tempfile'
 
 module Thin