At the least download the source rpms for krb5, krbafs, pam and pam_krb5 from the Fedora Development site;
http://download.fedora.redhat.com/pu...e/development/
Then build (you might have to meet some dependencies) the binary packages....
If extracted from /usr/src/redhat/SPECS/;
rpmbuild -bb spec_file_name_here
If not then; rpmbuild --recomplie --rebuild source_package_name_here
This way you will know they are for RHEL4.