8.1 cross build i386 -> amd64 fails

[Seeker]

World completes successfully, but kernel fails:

mkdep -f .depend -a   -nostdinc -D_KERNEL -DKLD_MODULE -DHAVE_KERNEL_OPTION_HEADERS -I. -I@ -I@/contrib/altq -
I/usr/obj/amd64/usr/src/sys/GENERIC /usr/src/sys/modules/amr/amr_linux/../../../dev/amr/amr_linux.c
/usr/src/sys/modules/amr/amr_linux/../../../dev/amr/amr_linux.c:43:36: error: machine/../linux/linux.h: No such file or directory
/usr/src/sys/modules/amr/amr_linux/../../../dev/amr/amr_linux.c:44:42: error: machine/../linux/linux_proto.h: No such file or directory
mkdep: compile failed
*** Error code 1
1 error
*** Error code 2
1 error
*** Error code 2
1 error
*** Error code 2
2 errors
*** Error code 2
1 error
*** Error code 2
1 error

 

[Seeker]

Hell, I took an USB stick and did a binary 8.1 amd64 install on it.
Booted from it and kernel compiled flawlessly

PS:
Core 2 Duo - 8.1 GENERIC
Kernel build time:
10:30 --> i386
08:30 --> amd64

Yes, without caching!