The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2021.01.01.23.07.48 sjg src/usr.bin/make/unit-tests/var-op-expand.mk,v 1.11 2021.01.01.23.17.15 roy src/external/bsd/unbound/lib/libunbound/Makefile,v 1.6 2021.01.01.23.24.31 roy src/external/bsd/unbound/dist/util/mini_event.c,v 1.4 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2021.01.html#2021.01.01.23.24.31