The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2021.07.08.15.21.40 christos src/tests/lib/libc/stdio/h_intr.c,v 1.2 2021.07.08.15.44.44 christos src/lib/libc/stdio/fflush.c,v 1.22 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2021.07.html#2021.07.08.15.44.44