The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.04.14.23.14.12 christos src/share/mk/bsd.own.mk,v 1.1056 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.04.html#2018.04.14.23.14.12