The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2021.09.23.11.28.47 christos src/sys/compat/linux/common/linux_misc_notalpha.c,v 1.113 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2021.09.html#2021.09.23.11.28.47