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Tox fails with no such option: --pre #126
This option fails with
Original comment by @hpk42
fix issue126: depend on virtualenv>=1.10.1 so that we can rely
→ <<cset 7a16cd37007c>>
Original comment by @jenisys
I also stumbled over this problem several times.
It is related with virtualenv and its
In addition, there seem to be multiple copies of "virtualenv_support" sometimes. This seems to occur when you install/upgrade virtualenv once with pip and once with easy_install (setuptools). Therefore, a feasible workaround can be to remove "virtualenv" and all its "virtualenv_support" directories from the "site-packages" directory and reinstall "virtualenv" again.
Maybe the best way is that the configuration option "install_command" is not only a function of the python version but also of the pip version (that gets installed per default).