NetCDF requirements to read ncdf files in R

I just tried to install the R package ncdf4. Installation could not be completed because the nc-config package of the NetCDF utilities is not present. A search suggests NetCDF files are in the Python-extras bundle, but I don’t see them listed when I scan the bundle contents, and, though I have the bundle installed, a search on ncdf* does not produce anything.

https://www.unidata.ucar.edu/software/netcdf/docs/faq.html#howtoget

Thanks