Combine –user with –prefix error with setup.py install

by

One time workaround:

pip install --user --install-option="--prefix=" <package_name>

or

python setup.py install --user --prefix=

Note that there is no text (not even whitespace) after the =.

Do not forget the --user flag.

Installing multiple packages:

Create ~/.pydistutils.cfg (or equivalent for your OS/platform) with the following contents:

[install]
prefix=

Note that there is no text (not even whitespace) after the =.

Then run the necessary pip install --user or python setup.py install --user commands. Do not forget the --user flag.

Finally, remove or rename this file. Leaving this file present will cause issues when installing Python packages system-wide (i.e., without --user) as this user with this ~/.pydistutils.cfg.

The cause of this issue

This appears to be an issue with both OpenSUSE and RedHat, which has lead to a bug in virtualenv on these platforms.

The error stems from a system-level distutils configuration file (in my case /usr/lib64/python2.6/distutils/distutils.cfg) where there was this

[install]
prefix=/usr/local

Basically, this is equivalent to always running the install command as install --prefix=/usr/local. You have to override this specification using one of the techniques above.

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