diff -r 5abea8a43f19 Lib/distutils/tests/test_build_ext.py
--- a/Lib/distutils/tests/test_build_ext.py	Sun Aug 05 18:20:17 2012 +1000
+++ b/Lib/distutils/tests/test_build_ext.py	Sun Aug 05 22:40:42 2012 +1200
@@ -15,6 +15,7 @@
 
 import unittest
 from test import support
+import shutil
 
 # http://bugs.python.org/issue4373
 # Don't load the xx module more than once.
@@ -66,7 +67,9 @@
             ALREADY_TESTED = True
 
         import xx
+        self._check_module(xx)
 
+    def _check_module(self, xx):
         for attr in ('error', 'foo', 'new', 'roj'):
             self.assertTrue(hasattr(xx, attr))
 
@@ -78,6 +81,32 @@
         self.assertTrue(isinstance(xx.Null(), xx.Null))
         self.assertTrue(isinstance(xx.Str(), xx.Str))
 
+    def test_build_ext_with_space(self):
+        # Test building an extension with spaces in the path.
+        copy_xxmodule_c(self.tmp_dir)
+        xx_c = os.path.join(self.tmp_dir, 'xxmodule.c')
+        spaced_xx_c = os.path.join(self.tmp_dir, 'xx module.c')
+        shutil.move(xx_c, spaced_xx_c)
+        xx_ext = Extension('xx', [spaced_xx_c])
+        dist = Distribution({'name': 'xx', 'ext_modules': [xx_ext]})
+        dist.package_dir = self.tmp_dir
+        cmd = build_ext(dist)
+        fixup_build_ext(cmd)
+        cmd.build_lib = self.tmp_dir
+        cmd.build_temp = self.tmp_dir
+
+        old_stdout = sys.stdout
+        if not support.verbose:
+            # silence compiler output
+            sys.stdout = StringIO()
+        try:
+            cmd.ensure_finalized()
+            cmd.run()
+        finally:
+            sys.stdout = old_stdout
+        import xx
+        self._check_module(xx)
+
     def tearDown(self):
         # Get everything back to normal
         support.unload('xx')
@@ -356,9 +385,6 @@
     def test_ext_fullpath(self):
         ext = sysconfig.get_config_vars()['SO']
         # building lxml.etree inplace
-        #etree_c = os.path.join(self.tmp_dir, 'lxml.etree.c')
-        #etree_ext = Extension('lxml.etree', [etree_c])
-        #dist = Distribution({'name': 'lxml', 'ext_modules': [etree_ext]})
         dist = Distribution()
         cmd = build_ext(dist)
         cmd.inplace = 1