-h, --help
    Show summary of options.

--version
    Show the version of the program.

-v, --verbose
    Be more verbose.

-q, --quiet
    Be less verbose; suppress unimportant output.

--clear
    Clear out a previously-created virtual Python instance in this location before creating a new one.

-p PYTHON_EXE,--python=PYTHON_EXE
    The Python interpreter to use to create the new environment.

--no-site-packages
    Ignored (the default).  Don´t give access to the global site-packages modules to the virtual
    environment.

--system-site-packages
    Give access to the global site-packages modules to the virtual environment.

--unzip-setuptools
    Unzip Setuptools or Distribute when installing it.

--relocatable
    Make an EXISTING virtualenv environment relocatable.

--distribute
    Ignored.  Distribute is used by default.  See --setuptools to use Setuptools instead of Distribute.

--setuptools
    Use Setuptools instead of Distribute. Set environ variable VIRTUALENV_SETUPTOOLS to make it the
    default.

--never-download
    Never download anything from the network.  Instead, fail if local distributions of
    setuptools/distribute/pip are not present.

--prompt==PROMPT
    Provides an alternative prompt prefix for this environment.