livecd / # env-update 
Traceback (most recent call last):
  File "/usr/sbin/env-update", line 10, in ?
    import portage
ImportError: Bad magic number in /usr/lib/portage/pym/portage.pyo
livecd / # 

livecd sysadmin # ls -l /usr/lib/portage/pym/portage.pyo
-rw-r--r--  1 root root 284763 Apr 27 03:16 /usr/lib/portage/pym/portage.pyo
livecd sysadmin #