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# Prefix must be absolute (not really necessary, but since a relative
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# prefix will be taken relative to *root* not working directory, it is
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# confusing if we allow it).
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if options.prefix[:1] not in (os.path.sep, os.path.altsep):
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print >>sys.stderr, """prefix must be an absolute path.
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(This will be interpreted relative to root, so provide --root=. if you