DF-5592 build log (guest, /root/df5592):
build.sh output:
Warning: Object directory not changed from original /root/df5592/ptsim3
cc  -O2 -pipe   -D_KERNEL -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Wcast-qual  -Wold-style-definition -Wmissing-include-dirs  -Wno-pointer-sign -Winit-self -Wundef -Wno-unused-but-set-variable -std=gnu11 -Werror -DKLD_MODULE -nostdinc  -I. -Idragonfly -I/root/df5592/ptsim3/forwarder_x86_64/include -Idragonfly/../include  -Wold-style-declaration -fno-common -ffreestanding -fno-stack-protector -fno-strict-aliasing -fno-strict-overflow -fno-asynchronous-unwind-tables -fno-omit-frame-pointer -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float -mno-fp-ret-in-387 -mindirect-branch=thunk-inline   -c ptsim3.c
ld -d -warn-common -r -d -o ptsim3.ko ptsim3.o
build OK:
-rw-r--r-- 1 root  wheel  22288 Oct  8 09:44 ptsim3/ptsim3.ko
(final version with mode 4: 23568 bytes, Oct  8 09:57)

Two earlier build failures (documented in VERDICT.md attempt log):
1. fatal error: opt_cam.h: No such file or directory
   -> fixed by cp /usr/obj/usr/src/sys/X86_64_GENERIC/opt_cam.h into the module dir
2. error: initialization discards 'volatile' qualifier ... SYSCTL_INT(&pts3_parked)
   -> pts3_parked made non-volatile