The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2021.12.18.17.58.48 christos src/sys/external/bsd/acpica/dist/common/dmtbinfo.c,v 1.20 2021.12.18.17.58.48 christos src/sys/external/bsd/acpica/dist/compiler/aslfiles.c,v 1.18 2021.12.18.17.58.48 christos src/sys/external/bsd/acpica/dist/compiler/aslutils.c,v 1.31 2021.12.18.17.58.48 christos src/sys/external/bsd/acpica/dist/compiler/dttable.c,v 1.16 2021.12.18.17.58.48 christos src/sys/external/bsd/acpica/dist/compiler/dtutils.c,v 1.19 2021.12.18.17.58.48 christos src/sys/external/bsd/acpica/dist/dispatcher/dsopcode.c,v 1.17 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/events/evregion.c,v 1.14 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/events/evrgnini.c,v 1.19 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/executer/exconfig.c,v 1.18 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/executer/exdebug.c,v 1.15 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/include/acapps.h,v 1.18 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/include/acdisasm.h,v 1.24 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/include/acpixf.h,v 1.32 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/include/actables.h,v 1.16 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/include/actypes.h,v 1.26 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/resources/rsdumpinfo.c,v 1.13 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/tables/tbdata.c,v 1.17 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/tables/tbfadt.c,v 1.17 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/tables/tbinstal.c,v 1.17 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/tables/tbutils.c,v 1.19 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/tables/tbxfload.c,v 1.15 2021.12.18.17.58.49 christos src/sys/external/bsd/acpica/dist/utilities/utdelete.c,v 1.8 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2021.12.html#2021.12.18.17.58.49