diskless kernel compilation for RedHat 7.3

[lothar at triumf.ca]

Hi,
I  am upgrading a cluster which contains 20 diskless nodes from
Redhat 6.1 to 7.3. For the diskless nodes I need new kernels
compiled for use in nfs-root. However, the 7.3 distribution of
redhat does not allow to configure the compilation instructions
accordingly (no nfs-root option). Any idea why and how this
can be remedied?

Thanx

Lothar