Hi, inet/in6_addr.c defines inet6_isipv4mapped but it's not in any header. The function is exported for all ports of glibc 2.1. In which header should it added? Philip, do you have any suggestions? Andreas -- Andreas Jaeger aj@arthur.rhein-neckar.de jaeger@informatik.uni-kl.de for pgp-key finger ajaeger@aixd1.rhrk.uni-kl.de