Index: python-tz/pytz/__init__.py
===================================================================
--- python-tz.orig/pytz/__init__.py
+++ python-tz/pytz/__init__.py
@@ -28,11 +28,6 @@ __all__ = [
 import sys, datetime, os.path, gettext
 from UserDict import DictMixin
 
-try:
-    from pkg_resources import resource_stream
-except ImportError:
-    resource_stream = None
-
 from tzinfo import AmbiguousTimeError, InvalidTimeError, NonExistentTimeError
 from tzinfo import unpickler
 from tzfile import build_tzinfo
@@ -50,17 +45,12 @@ def open_resource(name):
     Uses the pkg_resources module if available and no standard file
     found at the calculated location.
     """
+    # Patched in Debian, use the system zoneinfo from the tzdata package
     name_parts = name.lstrip('/').split('/')
     for part in name_parts:
         if part == os.path.pardir or os.path.sep in part:
             raise ValueError('Bad path segment: %r' % part)
-    filename = os.path.join(os.path.dirname(__file__),
-                            'zoneinfo', *name_parts)
-    if not os.path.exists(filename) and resource_stream is not None:
-        # http://bugs.launchpad.net/bugs/383171 - we avoid using this
-        # unless absolutely necessary to help when a broken version of
-        # pkg_resources is installed.
-        return resource_stream(__name__, 'zoneinfo/' + name)
+    filename = os.path.join('/usr/share/zoneinfo', *name_parts)
     return open(filename, 'rb')
 
 
