The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2017.01.16.15.44.05 christos src/sys/netinet/in_var.h,v 1.94 2017.01.16.15.44.46 christos src/sys/net/if_llatbl.c,v 1.17 2017.01.16.15.44.46 christos src/sys/net/if_spppsubr.c,v 1.167 2017.01.16.15.44.47 christos src/sys/netinet/dccp_usrreq.c,v 1.12 2017.01.16.15.44.47 christos src/sys/netinet/ip_carp.c,v 1.83 2017.01.16.15.44.47 christos src/sys/netinet/sctp_asconf.c,v 1.9 2017.01.16.15.44.47 christos src/sys/netinet/sctputil.c,v 1.12 2017.01.16.15.44.47 christos src/sys/netinet6/icmp6.c,v 1.206 2017.01.16.15.44.47 christos src/sys/netinet6/in6.c,v 1.236 2017.01.16.15.44.47 christos src/sys/netinet6/in6_gif.c,v 1.85 2017.01.16.15.44.47 christos src/sys/netinet6/in6_src.c,v 1.78 2017.01.16.15.44.47 christos src/sys/netinet6/in6_var.h,v 1.91 2017.01.16.15.44.47 christos src/sys/netinet6/ip6_forward.c,v 1.85 2017.01.16.15.44.47 christos src/sys/netinet6/ip6_input.c,v 1.173 2017.01.16.15.44.47 christos src/sys/netinet6/ip6_mroute.c,v 1.115 2017.01.16.15.44.47 christos src/sys/netinet6/ip6_output.c,v 1.182 2017.01.16.15.44.47 christos src/sys/netinet6/mld6.c,v 1.79 2017.01.16.15.44.47 christos src/sys/netinet6/nd6.c,v 1.226 2017.01.16.15.44.47 christos src/sys/netinet6/nd6_nbr.c,v 1.136 2017.01.16.15.44.47 christos src/sys/netinet6/nd6_rtr.c,v 1.131 2017.01.16.15.44.47 christos src/sys/netinet6/scope6.c,v 1.17 2017.01.16.15.44.47 christos src/sys/netipsec/ipsec.c,v 1.69 2017.01.16.15.46.19 christos src/sys/dist/pf/net/pf_osfp.c,v 1.13 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2017.01.html#2017.01.16.15.46.19