Mercurial 2.1.1 fails to build on OS X Lion with Xcode 4.3 and command line tools installed

[Scott Palmer]

This changeset: http://selenic.com/repo/hg/rev/82ce91a9fd94

  changeset:   16187:82ce91a9fd94
  branch:      stable
  parent:      16179:be6ac2ecc7f8
  user:        Greg Ward <greg at gerg.ca>
  date:        Mon Feb 27 08:54:26 2012 -0500
  files:       setup.py
  description:
  setup: handle output from Apple's Xcode 4.3 better (issue3277)

  Apparently, it prints nothing at all if the user installed only the
  command-line tools. In that case, don't try to parse the empty output
  -- just assume they have Xcode >= 4.

Apparently isn't working when you have Xcode 4.3 and *do* have the command line tools installed.  See for yourself:

$ hg sum

parent: 16202:53e2cd303ecf 2.1.1
 dirstate: filecacheify _ignore (issue3278)
branch: stable
commit: (clean)
update: 2 new changesets (update)

$ make all
python setup.py  build
Traceback (most recent call last):
  File "setup.py", line 457, in <module>
    version = version.splitlines()[0]
AttributeError: 'list' object has no attribute 'splitlines'
make: *** [build] Error 1

$ xcodebuild -version
Xcode 4.3
Build version 4E109


If I had Python skills I would try to fix it…  but I don't… so I'm asking for assistance.

Thanks,

Scott
(please keep me CC'd. I'm not subscribed to the dev list)