2.4.10-ac1: undefined reference to rpc_queue_lock

[Frank Davis]

Hello,
     While building 2.4.10-ac1, I received the following:
......
	-o vmlinux
net/network.o: In function 'udp_data_ready'
net/network.o(.text+0x56ebc): undefined reference to 'rpc_queue_lock'
net/network.o(.text+0x56ec2): undefined reference to 'rpc_queue_lock'
net/network.o(.text+0x56f62): undefined reference to 'rpc_queue_lock'
net/network.o(.text+0x56f82): undefined reference to 'rpc_queue_lock'
net/network.o(.text+0x56fa2): undefined reference to 'rpc_queue_lock'
net/network.o(.text+0x5731e): more undefined references to 
'rpc_queue_lock' follow
make: *** [vmlinux] Error 1