[CMake] Environment variable for a custom command

[Bill Hoffman]

Gregory C. Sharp wrote:
> 
> I found this little tidbit in the FAQ:
> 
>   [E]nvironment variables SET in the CMakeLists.txt only take
>   effect for cmake itself, so you cannot use this method to set
>   an environment variable that a custom command might need.
> 
> I would like to augment the path during a custom command.
> Is there a suggested workaround?
> 
Run a cmake script in the custom command that runs the program via 
execute_process.

-Bill