According to
  http://www.natur.cuni.cz/~listserv/krb4/krb4.200311/msg00025.html
krb4 1.2 works with OpenSSL 0.9.6, but not OpenSSL 0.9.7
config script appears to require g++
needs some sort of db.h (i.e libdb-dev)
krb4 1.2 probably doesn't build against libdb 4.1