Cannot compile denx 2.6.15 for MBX

[Antonio Di Bacco]

I do:

>make mrproper
>make MBX_config

HOSTCC  scripts/basic/fixdep
HOSTCC  scripts/basic/split-include
HOSTCC  scripts/basic/docproc
make[1]: *** No rule to make target `MBX_config'.  Stop.
make: *** [MBX_config] Error 2

What's the problem?

Thank you.