/usr/include/gssrpc/pmap_prot.h is in libkrb5-dev 1.10+dfsg~beta1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/include/gssrpc/../mit-krb5/gssrpc/pmap_prot.h
/usr/include/gssrpc/../mit-krb5/gssrpc/pmap_prot.h