[coreboot] error in FILO configuration

[ali hagigat]

I have FILO source code in:                 /root/build/coreboot/filo
and COREBOOT source code is in:       /root/build/coreboot/coreboot-v4

When i execute the instruction below, it is followed by an error:
/root/build/coreboot/filo> make menuconfig
Libpayload config for FILO.
can't find file /root/build/coreboot/filo/../libpayload/Config.in
make: *** [menuconfig] Error 1

How can i correct it?