broken pip --user install

[ibtaylor]

System Info

• Operating System: uname -a
Linux 4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6 14:45:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
• Python Version: python --version
Python 2.7.15rc1
• Version of catkin_tools: catkin --version OR Git revision
  Not relevant
• ROS Distro: echo $ROS_DISTRO
N/A (using outside of ros)

Build / Run Issue

• Works with catkin_make
• Works with catkin_make_isolated --merge
• Works with catkin build
• Works with catkin build -p1
• I did not read this
• Not applicable

Expected Behavior

I should be able to do a user install of catkin_tools.

Actual Behavior

It fails to install

Installing collected packages: catkin-tools
  Running setup.py install for catkin-tools ... error
    Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-cE992M/catkin-tools/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-8xEZNz/install-r
ecord.txt --single-version-externally-managed --compile --user --prefix=:
    usage: -c [--user | --prefix PREFIX]
    -c: error: argument --prefix: not allowed with argument --user/--home

    ----------------------------------------
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-cE992M/catkin-tools/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-8xEZNz/install-record.txt --single-versi
on-externally-managed --compile --user --prefix=" failed with error code 2 in /tmp/pip-install-cE992M/catkin-tools/

Steps to Reproduce the Issue

pip install --user --no-cache-dir catkin_tools==0.4.4