Index: setup.py
===================================================================
--- setup.py	(revision 74520)
+++ setup.py	(working copy)
@@ -19,6 +19,8 @@
 # This global variable is used to hold the list of modules to be disabled.
 disabled_module_list = []
 
+exit_status = 0
+
 def add_dir_to_list(dirlist, dir):
     """Add the directory 'dir' to the list 'dirlist' (at the front) if
     1) 'dir' is not already in 'dirlist'
@@ -211,6 +213,8 @@
             print
 
         if self.failed:
+            global exit_status
+            exit_status = 1
             failed = self.failed[:]
             print
             print "Failed to build these modules:"
@@ -1895,6 +1899,7 @@
                      'Tools/scripts/2to3',
                      'Lib/smtpd.py']
         )
+    sys.exit(exit_status)
 
 # --install-platlib
 if __name__ == '__main__':