2005.0(2.12.r6)核心编译错误

jackyfz

我在gentoo2005下安装VDR FOR GENTOO，在安装twinhan-1020卡的驱动，进行对核心重新编译，
在编译到Modules 结束的时候，出现以下的警告提示是什么原因？如何解决？

INSTALL net/sunrpc/sunrpc.ko
if [ -r System.map -a -x /sbin/depmod ];then /sbin/depmod -ae -F Syetem.amp 2.12-gentoo-r6; fi
WARNING: /lib/modules/2.6.12-gentoo-r6/kernel/drivers/media/dvb/dvb-core.ko need unknown symbol class_destroy
WARNING: /lib/modules/2.6.12-gentoo-r6/kernel/drivers/media/dvb/dvb-core.ko need unknown symbol class_create
WARNING: /lib/modules/2.6.12-gentoo-r6/kernel/drivers/media/dvb/dvb-core.ko need unknown symbol class_drivers_destroy
WARNING: /lib/modules/2.6.12-gentoo-r6/kernel/drivers/media/dvb/dvb-core.ko need unknown symbol class_drivers_create