I'm trying to install the python module 'Pycpx' but I'm getting an error that it can't find an environment variable 

[Pycpx](http://www.stat.washington.edu/~hoytak/code/pycpx/download.html)

> 
> Exception: CPLEX concert include directory not found: please set
>  environment variable CPLEX\_PATH to point to the base of the
>  CPlex/Concert installation. Attempting to find files:
>  ilconcert/iloexpression.h, ilconcert/iloalg.h, ilconcert/iloenv.h,
>  ilconcert/ilosolution.h.
> 
> 
> 

I create a file called .bash\_profile in my home directory and I put this line in it which points to the folder where these header files are located. 

```
CPLEX_PATH = /home/joe/concert/include/ilconcert

```

Is this the correct way to add environment variables as I am still getting the error?

I get this error whether I install with `easy_install pycpx` or I get the source tarball from here [tarball](http://pypi.python.org/pypi/pycpx/) and run `python setup.py install`. 

Many thanks