In article <20141220131549.1F8139A%cvs.netbsd.org@localhost>, Patrick Welche <source-changes-d%NetBSD.org@localhost> wrote: > if (err < 0) { err = errno; perror("setsockopt - IPV6_RECVPKTINFO"); } > } >-#elif defined(IPV6_PKTINFO) >+ #elif defined(IPV6_PKTINFO) > if (err == 0) > { > Why? christos