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Merge bzr.dev

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setup.py
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    print >>sys.stderr, "bzr: error: cannot find a suitable python interpreter"
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    print >>sys.stderr, "  (need %d.%d or later)" % NEED_VERS
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    sys.exit(1)
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if hasattr(os, "unsetenv"):
 
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if getattr(os, "unsetenv", None) is not None:
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    os.unsetenv(REINVOKE)
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