The PythonSystemFixes package of the OS X installer fixes a specific 
compatibility problem with the Apple-supplied Python 2.3 on OS X 10.3. The 
attached patches changes the build installer script to include that 
package in the installer only if the installer image includes 10.3 as a 
targeted system.

Further investigation reveals that the underlying script Mac/Tools/fixapplepython23.py is broken on 3.x:

1. the version test using platform.mac_ver is incorrect
Traceback (most recent call last):
  File "fixapplepython23.py", line 131, in <module>
    main()
  File "fixapplepython23.py", line 103, in main
    if osver != '10.3' and os.ver < '10.3.':
AttributeError: 'module' object has no attribute 'ver'

2. and, even if the typo is corrected, osver returns a tuple
      >>> osver =  platform.mac_ver()
      >>> osver
        ('10.5.7', ('', '', ''), 'PowerPC')

The above are only seen on PPC builds since the script bails out earlier 
if running on an Intel platform.

At this point, it is a minor issue and the number of users who might be 
impacted must be few and getting fewer; eventually PythonSystemFixes 
should be removed when or before 10.3 is no longer supported.

With the installer build updates referenced by Issue8068, PythonSystemFixes is now only included in installers targeted for 10.3.