=== module build (inside guest, pristine audit-tree source) ===
$ cd /usr/src/sys/dev/misc/ipmi && make
cc -O2 -pipe ... -Werror -DKLD_MODULE ... -c ipmi.c
cc ... -c ipmi_acpi.c
cc -Wl,--build-id=sha1 -nostdlib -Wl,--hash-style=sysv -r -Wl,-d -o ipmi.ko ipmi.o ipmi_kcs.o ipmi_smic.o ipmi_smbios.o ipmi_ssif.o ipmi_acpi.o ipmi_isa.o ipmi_pci.o ipmi_smbus.o
(zero warnings, -Werror, ipmi_acpi.c md5 33a70ae5d7e34a2d4b34c5dca91ab8df = pristine audit tree)

=== kernel build (inside guest) ===
$ cd /usr/src && make -j6 nativekernel KERNCONF=X86_64_GENERIC
>>> Kernel build for X86_64_GENERIC completed on Wed Sep 30 08:57:20 UTC 2026
$ make installkernel KERNCONF=X86_64_GENERIC
>>> Kernel install for X86_64_GENERIC completed on Wed Sep 30 09:02:47 UTC 2026

=== fix build ===
fix.diff applied to /usr/src/sys/dev/misc/ipmi/{ipmi_acpi.c,ipmi.c}; make; cc -Wl,... -o ipmi.ko ...; cp ipmi.ko /root/ipmi-fixed.ko (md5 ipmi_acpi.c 8e4769e822f5970d07e3768fd3249fe9)