Progress has been made, but still a no-go. I really with the maintainer would share his build commands or make us a package.
I installed rpcgen (which was missing, and hence the error) (in glibc_apps package)
I can configure, and then:
Make RPCGEN="rpcgen -Y /usr/local/bin"
Which failed because its missing generated Makeflie.normal in the module directories.
I then installed xmkmf (in the imake package), which I assumed is missing, but it did not fix it.