In file included from /usr/src/sys/sys/pcpu.h:46,
                 from /usr/home/abber/src/vbox/src/VBox/Runtime/r0drv/freebsd/the-freebsd-kernel.h:46,
                 from /usr/home/abber/src/vbox/src/VBox/Runtime/r0drv/freebsd/alloc-r0drv-freebsd.c:34:
/usr/include/machine/pcpu.h:171:2: #error this file needs to be ported to your compiler
In file included from /usr/home/abber/src/vbox/src/VBox/Runtime/r0drv/freebsd/the-freebsd-kernel.h:53,
                 from /usr/home/abber/src/vbox/src/VBox/Runtime/r0drv/freebsd/alloc-r0drv-freebsd.c:34:
/usr/src/sys/sys/sched.h: In function `sched_pin':
/usr/src/sys/sys/sched.h:100: warning: implicit declaration of function `PCPU_GET'
/usr/src/sys/sys/sched.h:100: warning: nested extern declaration of `PCPU_GET'
/usr/src/sys/sys/sched.h:100: error: `curthread' undeclared (first use in this function)
/usr/src/sys/sys/sched.h:100: error: (Each undeclared identifier is reported only once
/usr/src/sys/sys/sched.h:100: error: for each function it appears in.)
/usr/src/sys/sys/sched.h:100: error: invalid type argument of `->'
/usr/src/sys/sys/sched.h: In function `sched_unpin':
/usr/src/sys/sys/sched.h:106: warning: nested extern declaration of `PCPU_GET'
/usr/src/sys/sys/sched.h:106: error: `curthread' undeclared (first use in this function)
/usr/src/sys/sys/sched.h:106: error: invalid type argument of `->'
kmk[3]: *** [/usr/home/abber/src/vbox/out/freebsd.x86/release/obj/src/VBox/Runtime/RuntimeR0Drv/r0drv/freebsd/alloc-r0drv-freebsd.o] Error 1
kmk[2]: *** [pass_libraries_before] Error 2
kmk[1]: *** [pass_libraries_before] Error 2
kmk: *** [pass_libraries_before] Error 2