set correct paths

setup.py

@@ -197,6 +197,16 @@ class write_data_install_path(cmd.Command):
 		conf_filename = os.path.join(self.lib_build_dir,
 			'deluge', 'common.py')
 
+		conf_file = open(conf_filename, 'r')
+		data = conf_file.read()
+		conf_file.close()
+		data = data.replace('@datadir@', self.prefix)
+		conf_file = open(conf_filename, 'w')
+		conf_file.write(data)
+		conf_file.close()
+		conf_filename = os.path.join(self.lib_build_dir,
+			'deluge', 'interface.py')
+
 		conf_file = open(conf_filename, 'r')
 		data = conf_file.read()
 		conf_file.close()

src/interface.py

@@ -48,7 +48,7 @@ import ipc_manager
 import plugins
 import tab_details
 import tab_files
-
+INSTALL_PREFIX = '@datadir@'
 class DelugeGTK:
     def __init__(self):
         self.ipc_manager = ipc_manager.Manager(self)
@@ -123,7 +123,7 @@ class DelugeGTK:
         def new_release_check():
             import os, sys
             py_version = sys.version[:3]
-            file = '/usr/lib/python' + py_version + '/site-packages/deluge/update.py'
+            file = INSTALL_PREFIX + '/lib/python' + py_version + '/site-packages/deluge/update.py'
             os.spawnlp(os.P_NOWAIT, 'python', 'python', file, common.PROGRAM_VERSION)
 
         if self.config.get("new_releases"):