/proc/net/netstat not found

I am trying to compile my own Linux for embededd devices, using the OpenWRT distribution. I am trying to get some Multicast information using the /proc/net/netstat interface but it is not found (normally this is available on my desktop). If I am right this should be enabled in the kernel_menuconfig but I am not able to find any option related to this. **UPDATE**: i was trying with kernel 3.10.49and 4.4.14. In both cases proc.c is compiled (proc.o is available in my build_dir, /proc is mounted, but /proc/net/netstat does not exists.