Slightly different (of course it is a Mac) to Ubuntu
showmount -e <server>
This should list the exports from the NFS Server.
Make a Mount Point
Mount The drive
mount -o rw -t nfs -o resvport 192.168.1.197:/export/drive4 drive4/
You may want to try without the -o resvport (which is the Ubuntu way - but it did not work for me).