ValueError "Expected version spec" when installing local wheel via pip

I was using a very out-of-date version of PIP.

$ pip -Vpip 1.3.1 from C:\Python27\lib\site-packages (python 2.7)

I upgraded to pip 6.0.8 and all is well.

python python-2.7 pip python-wheel

Using the Ubuntu 14.04 AMI on AWS, I found I had to upgrade setuptools:

sudo pip3 install -vU setuptools

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