The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2016.10.31.04.15.22 nonaka src/sys/dev/usb/usbdevs,v 1.722 2016.10.31.04.16.25 ozaki-r src/sys/netinet6/icmp6.c,v 1.200 2016.10.31.04.16.25 ozaki-r src/sys/netinet6/in6_pcb.c,v 1.151 2016.10.31.04.16.25 ozaki-r src/sys/netinet6/in6_src.c,v 1.72 2016.10.31.04.16.25 ozaki-r src/sys/netinet6/ip6_var.h,v 1.69 2016.10.31.04.16.25 ozaki-r src/sys/netinet6/nd6_nbr.c,v 1.129 2016.10.31.04.16.25 ozaki-r src/sys/netinet6/raw_ip6.c,v 1.152 2016.10.31.04.16.25 ozaki-r src/sys/netinet6/udp6_output.c,v 1.54 2016.10.31.04.16.29 nonaka src/sys/dev/usb/usbdevs.h,v 1.714 2016.10.31.04.16.29 nonaka src/sys/dev/usb/usbdevs_data.h,v 1.715 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2016.10.html#2016.10.31.04.16.29