diff --git a/CHANGES b/CHANGES
index bc5278a44..da99816a9 100644
--- a/CHANGES
+++ b/CHANGES
@@ -39,9 +39,15 @@ Release 1.0 (in development)
 * Added simplified Chinese locale.
 
 
-Release 0.6.3 (in development)
+Release 0.6.4 (in development)
 ==============================
 
+
+Release 0.6.3 (Sep 03, 2009)
+============================
+
+* Properly add C module filenames as dependencies in autodoc.
+
 * #253: Ignore graphviz directives without content instead of
   raising an unhandled exception.
 
diff --git a/sphinx/application.py b/sphinx/application.py
index ed17f1a67..1296e5752 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -29,7 +29,7 @@ from sphinx.domains import all_domains
 from sphinx.builders import BUILTIN_BUILDERS
 from sphinx.directives import GenericDesc, Target, additional_xref_types
 from sphinx.environment import BuildEnvironment, SphinxStandaloneReader
-from sphinx.util import pycompat
+from sphinx.util import pycompat  # imported for side-effects
 from sphinx.util.tags import Tags
 from sphinx.util.compat import Directive, directive_dwim
 from sphinx.util.console import bold
diff --git a/sphinx/builders/changes.py b/sphinx/builders/changes.py
index ad0b8d195..c1ea14a88 100644
--- a/sphinx/builders/changes.py
+++ b/sphinx/builders/changes.py
@@ -10,7 +10,6 @@
 """
 
 import codecs
-import shutil
 from os import path
 from cgi import escape
 
diff --git a/sphinx/environment.py b/sphinx/environment.py
index dc78951af..bd93c91c4 100644
--- a/sphinx/environment.py
+++ b/sphinx/environment.py
@@ -22,11 +22,6 @@ import cPickle as pickle
 from os import path
 from glob import glob
 from itertools import izip, groupby
-try:
-    from hashlib import md5
-except ImportError:
-    # 2.4 compatibility
-    from md5 import md5
 
 from docutils import nodes
 from docutils.io import FileInput, NullOutput
diff --git a/sphinx/ext/autodoc.py b/sphinx/ext/autodoc.py
index 2b280d673..705853c20 100644
--- a/sphinx/ext/autodoc.py
+++ b/sphinx/ext/autodoc.py
@@ -14,8 +14,7 @@
 import re
 import sys
 import inspect
-from types import ModuleType, FunctionType, BuiltinFunctionType, MethodType, \
-     ClassType
+from types import FunctionType, BuiltinFunctionType, MethodType, ClassType
 
 from docutils import nodes
 from docutils.utils import assemble_option_dict
@@ -626,11 +625,15 @@ class Documenter(object):
         # try to also get a source code analyzer for attribute docs
         try:
             self.analyzer = ModuleAnalyzer.for_module(self.real_modname)
-            # parse right now, to get PycodeErrors on parsing
-            self.analyzer.parse()
+            # parse right now, to get PycodeErrors on parsing (results will
+            # be cached anyway)
+            self.analyzer.find_attr_docs()
         except PycodeError, err:
             # no source file -- e.g. for builtin and C modules
             self.analyzer = None
+            # at least add the module.__file__ as a dependency
+            if hasattr(self.module, '__file__') and self.module.__file__:
+                self.directive.filename_set.add(self.module.__file__)
         else:
             self.directive.filename_set.add(self.analyzer.srcname)
 
diff --git a/sphinx/ext/graphviz.py b/sphinx/ext/graphviz.py
index 1b6a03eef..449d9524a 100644
--- a/sphinx/ext/graphviz.py
+++ b/sphinx/ext/graphviz.py
@@ -10,9 +10,7 @@
     :license: BSD, see LICENSE for details.
 """
 
-import os
 import re
-import sys
 import posixpath
 from os import path
 from subprocess import Popen, PIPE
diff --git a/sphinx/ext/inheritance_diagram.py b/sphinx/ext/inheritance_diagram.py
index 6536f94c0..e464adb57 100644
--- a/sphinx/ext/inheritance_diagram.py
+++ b/sphinx/ext/inheritance_diagram.py
@@ -36,11 +36,9 @@
     :license: BSD, see LICENSE for details.
 """
 
-import os
 import re
 import sys
 import inspect
-import subprocess
 try:
     from hashlib import md5
 except ImportError:
diff --git a/sphinx/jinja2glue.py b/sphinx/jinja2glue.py
index 626e7f8a8..e2c96a963 100644
--- a/sphinx/jinja2glue.py
+++ b/sphinx/jinja2glue.py
@@ -9,7 +9,6 @@
     :license: BSD, see LICENSE for details.
 """
 
-import codecs
 from os import path
 from pprint import pformat
 
diff --git a/sphinx/pycode/__init__.py b/sphinx/pycode/__init__.py
index 1187b6a43..fa8d0e948 100644
--- a/sphinx/pycode/__init__.py
+++ b/sphinx/pycode/__init__.py
@@ -234,6 +234,8 @@ class ModuleAnalyzer(object):
         attr_visitor = AttrDocVisitor(number2name, scope, self.encoding)
         attr_visitor.visit(self.parsetree)
         self.attr_docs = attr_visitor.collected
+        # now that we found everything we could in the tree, throw it away
+        # (it takes quite a bit of memory for large modules)
         self.parsetree = None
         return attr_visitor.collected
 
diff --git a/sphinx/search.py b/sphinx/search.py
index f283881fa..7f1a87a97 100644
--- a/sphinx/search.py
+++ b/sphinx/search.py
@@ -10,7 +10,6 @@
 """
 import re
 import cPickle as pickle
-from cStringIO import StringIO
 
 from docutils.nodes import comment, Text, NodeVisitor, SkipNode
 
diff --git a/sphinx/util/__init__.py b/sphinx/util/__init__.py
index 05e72caf1..87b08095f 100644
--- a/sphinx/util/__init__.py
+++ b/sphinx/util/__init__.py
@@ -443,7 +443,7 @@ def split_explicit_title(text):
     """Split role content into title and target, if given."""
     match = explicit_title_re.match(text)
     if match:
-        return True, m.group(1), m.group(2)
+        return True, match.group(1), match.group(2)
     return False, text, text