btxv86.h file not found (amd64 system) buildworld (test gsoc project)

[Andrey Fesenko]

Hello,
I'm test [gsoc15] dynamically discover bes, this project i386-only?

If buildworld

uname -a
FreeBSD des.local 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r285895M: Sun
Jul 26 23:02:06 MSK 2015
root at des.local:/usr/obj/usr/src/sys/GENERIC  amd64

....
CC='cc  ' mkdep -f .depend -a    -DBOOTPROG=\"zfsloader\"
-I/usr/src/sys/boot/zfs/../com
mon -I/usr/src/sys/boot/zfs/../.. -I.
-I/usr/src/sys/boot/zfs/../../../lib/libstand -I/u
sr/src/sys/boot/zfs/../../cddl/boot/zfs -D_STANDALONE -std=gnu99
/usr/src/sys/boot/zfs
/zfs.c /usr/src/sys/boot/zfs/bootenv.c /usr/src/sys/boot/zfs/boot_menu.c
/usr/src/sys/boot/zfs/boot_menu.c:1:10: fatal error: 'btxv86.h' file not found
#include <btxv86.h>
         ^
1 error generated.
mkdep: compile failed
*** [.depend] Error code 1
....