use emerge
Traceback (most recent call last):
File "/usr/lib/python2.7/site.py", line 554, in <module>
main()
File "/usr/lib/python2.7/site.py", line 536, in main
known_paths = addusersitepackages(known_paths)
File "/usr/lib/python2.7/site.py", line 268, in addusersitepackages...