kernel 2.4.26 and qos + htb

Hi

     I try to compile kernel 2.4.26 with qos and htb enabled for mips
platform. However, it fails during linking and throws errors like this:

net/network.o(.text.init+0x598): In function `net_dev_init':
: undefined reference to `pktsched_init'
net/network.o(__ksymtab+0x860): undefined reference to `psched_time_base'
net/network.o(__ksymtab+0x868): undefined reference to `psched_time_mark'
net/network.o(__ksymtab+0x870): undefined reference to `pfifo_qdisc_ops'
net/network.o(__ksymtab+0x878): undefined reference to `bfifo_qdisc_ops'
net/network.o(__ksymtab+0x880): undefined reference to `register_qdisc'
net/network.o(__ksymtab+0x888): undefined reference to `unregister_qdisc'
net/network.o(__ksymtab+0x890): undefined reference to `qdisc_get_rtab'
net/network.o(__ksymtab+0x898): undefined reference to `qdisc_put_rtab'
net/network.o(__ksymtab+0x8a0): undefined reference to `qdisc_copy_stats'
net/network.o(__ksymtab+0x8a8): undefined reference to
`register_tcf_proto_ops'
net/network.o(__ksymtab+0x8b0): undefined reference to
`unregister_tcf_proto_ops'

Is that mean that I maybe forgot about setting some other options? I
also tried to alternate the Makefile in net/sched directory in order to
get the modules I want and then it compiles and links without errors. In
that case is it good when I compile kernel with the modified Makefile?
Or maybe it is somthing wrong with the kernel itself?

The options that I want to have enabled are as follows:

#
# QoS and/or fair queueing
#
CONFIG_NET_SCHED=y
CONFIG_NET_SCH_HTB=y
CONFIG_NET_QOS=y
CONFIG_NET_CLS=y
CONFIG_NET_CLS_TCINDEX=y
CONFIG_NET_CLS_ROUTE4=y
CONFIG_NET_CLS_ROUTE=y
CONFIG_NET_CLS_FW=y

Thanks in advance for any help.

Sebastian.