I know the obvious answer is to use virtualenv and virtualenvwrapper, but for various reasons I can\'t/don\'t want to do that.
So how do I modify the command
With pip v1.5.6 on Python v2.7.3 (GNU/Linux), option --root allows to specify a global installation prefix, (apparently) irrespective of specific package's options. Try f.i.,
v1.5.6
v2.7.3
--root
$ pip install --root=/alternative/prefix/path package_name