The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2016.12.27.13.43.38 christos src/usr.sbin/npf/npfctl/npfctl.c,v 1.49 2016.12.27.13.49.58 christos src/sys/net/if_spppsubr.c,v 1.165 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2016.12.html#2016.12.27.13.49.58