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Could not find platform dependent libraries <exec_prefix>

Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]

'import site' failed; use -v for traceback

Traceback (most recent call last):

  File "/usr/bin/emerge", line 23, in ?

    import os, stat

  File "/usr/lib/python2.4/os.py", line 48, in ?

    import posixpath as path

ImportError: No module named posixpath