compilation notes on a linux system

For some reason cprnc did not readily build on my system. Also, I could not figure out how to pass either the correct flags to define netcdf, or the environment variables to define netcdf.

Ultimately, I just hacked into the file cmake/FindNetCDF.cmake and hard-coded in the lines for execute process that calls the nc-config and the nf-config where I have netcdf installed.

For instance to force it to define the netcdf fortran include dirs, I just added the path to my nf-config, like so:

```
execute_process(COMMAND /home/rgknox/local/netcdf-4.9.0/bin/nf-config --includedir
OUTPUT_VARIABLE DEFAULT_Fortran_INCLUDE_DIR
OUTPUT_STRIP_TRAILING_WHITESPACE)

```

This is probably a really silly way to get it to find the netcdf includes and libs, but I tried many environment variable combinations and just couldn't find anything that worked.

Also, like other issue creators have mentioned, yes, you do have to run "make" after you run "cmake".