[Seisunix] Compilation probles wis dist CWP-44.26

Dear All, Has anybody struggled with compiling version 44.26 and having trouble when compiling with the xdr I am getting messages like

src/su/lib/fgettr.c:148: undefined reference to `xdr_float'

src/su/lib/fputtr.c:123: undefined reference to `xdr_vector'

I am running Ubuntu 22.04 and somehow, although xdr.h is installed at rpc/xdr.h I am not sure why the compiler does not locate it.

Anu suggestions.