The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.10.29.15.37.45 christos src/sys/rump/net/lib/libnpf/Makefile,v 1.26 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.10.html#2018.10.29.15.37.45