mercurial 1.3.1 on 10.6 fails to run

[macosforge@…]

I get the following when trying to run mercurial on 10.6:

$ hg
Traceback (most recent call last):
  File "/opt/local/bin/hg", line 27, in <module>
    mercurial.dispatch.run()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/mercurial/dispatch.py", line 16, in run
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/mercurial/dispatch.py", line 21, in dispatch
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/mercurial/ui.py", line 35, in __init__
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/mercurial/util.py", line 1217, in rcpath
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/mercurial/util.py", line 1193, in os_rcpath
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/mercurial/posix.py", line 41, in system_rcpath
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/mercurial/posix.py", line 30, in rcfiles
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/mercurial/demandimport.py", line 75, in __getattribute__
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/mercurial/demandimport.py", line 47, in _load
ImportError: No module named osutil

[jmroot (Joshua Root)]

None of the .so files installed by mercurial appear to be world readable.

[jmroot (Joshua Root)]

This looks like the issue described in #21389.