undefined symbol: random_source_register during kernel compilation

Hi


I have been trying to compile a freebsd-current kernel since the 16th of July, and keep getting the following error during "make buildkernel":


Building /usr/obj/usr/src/amd64.amd64/sys/G13NEW/kernel.full
linking kernel.full
ld: error: undefined symbol: random_source_register
>>> referenced by ivy.c:108 (/usr/src/sys/dev/random/ivy.c:108)
>>>               ivy.o:(rdrand_modevent)

ld: error: undefined symbol: random_source_deregister
>>> referenced by ivy.c:115 (/usr/src/sys/dev/random/ivy.c:115)
>>>               ivy.o:(rdrand_modevent)

ld: error: undefined symbol: random_source_register
>>> referenced by nehemiah.c:124 (/usr/src/sys/dev/random/nehemiah.c:124)
>>>               nehemiah.o:(nehemiah_modevent)

ld: error: undefined symbol: random_source_deregister
>>> referenced by nehemiah.c:133 (/usr/src/sys/dev/random/nehemiah.c:133)
>>>               nehemiah.o:(nehemiah_modevent)
*** Error code 1

Stop.
make[2]: stopped in /usr/obj/usr/src/amd64.amd64/sys/G13NEW
.ERROR_TARGET='kernel.full'
.ERROR_META_FILE='/usr/obj/usr/src/amd64.amd64/sys/G13NEW/kernel.full.meta'
.MAKE.LEVEL='2'
MAKEFILE=''
.MAKE.MODE='meta missing-filemon=yes missing-meta=yes silent=yes verbose curdirOk=
yes'

I deleted and resynchronized the source tree and emptied the /usr/obj directory, but it did not help.

How could I get kernel compilation work again? I would like to say that the make.conf, src.conf files as well as my kernel configuration file was not changed since a couple of months (since I installed freebsd-current).

rgds

?