The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2021.05.27.17.13.20 christos src/share/mk/bsd.own.mk,v 1.1251 2021.05.27.17.41.28 christos src/share/mk/bsd.own.mk,v 1.1252 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2021.05.html#2021.05.27.17.41.28