pip install fails: "ImportError: no module named wheel"

Problem: I am trying to install `pelican` within a python 2 virtual environment which I have created using `conda`.  However, I keep receiving an import error despite the fact that `wheel` is installed in the virtual environment.



Troubleshooting: I have tried creating a new virtual env as well as forcing pip to redownload the required wheels (i.e. `pip install pelican --no-cache-dir`); no luck.



conda env package list:

```

blinker                   1.4                       <pip>

certifi                   2016.2.28                py27_0  

feedgenerator             1.9                       <pip>

Markdown                  2.6.11                    <pip>

openssl                   1.0.2l                        0  

pip                       9.0.1                    py27_1  

python                    2.7.13                        0  

pytz                      2017.3                    <pip>

readline                  6.2                           2  

setuptools                36.4.0                   py27_1  

six                       1.11.0                    <pip>

sqlite                    3.13.0                        0  

tk                        8.5.18                        0  

Unidecode                 1.0.22                    <pip>

wheel                     0.29.0                   py27_0  

zlib                      1.2.11                        0  



```



Traceback:

```

    Traceback (most recent call last):

      File "<string>", line 1, in <module>

      File "/tmp/pip-build-3XGD0q/feedgenerator/setup.py", line 58, in <module>

        zip_safe=False,

      File "/home/jkarimi91/Apps/anaconda2/envs/website/lib/python2.7/site-packages/setuptools/__init__.py", line 129, in setup

        return distutils.core.setup(**attrs)

      File "/home/jkarimi91/Apps/anaconda2/envs/website/lib/python2.7/distutils/core.py", line 151, in setup

        dist.run_commands()

      File "/home/jkarimi91/Apps/anaconda2/envs/website/lib/python2.7/distutils/dist.py", line 953, in run_commands

        self.run_command(cmd)

      File "/home/jkarimi91/Apps/anaconda2/envs/website/lib/python2.7/distutils/dist.py", line 972, in run_command

        cmd_obj.run()

      File "/home/jkarimi91/Apps/anaconda2/envs/website/lib/python2.7/site-packages/setuptools/command/install.py", line 61, in run

        return orig.install.run(self)

      File "/home/jkarimi91/Apps/anaconda2/envs/website/lib/python2.7/distutils/command/install.py", line 575, in run

        self.run_command(cmd_name)

      File "/home/jkarimi91/Apps/anaconda2/envs/website/lib/python2.7/distutils/cmd.py", line 326, in run_command

        self.distribution.run_command(command)

      File "/home/jkarimi91/Apps/anaconda2/envs/website/lib/python2.7/distutils/dist.py", line 972, in run_command

        cmd_obj.run()

      File "/home/jkarimi91/Apps/anaconda2/envs/website/lib/python2.7/site-packages/setuptools/command/install_scripts.py", line 17, in run

        import 

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