Help!

Hello,I'm your Chinese user,a flash user.There's some problem I had have.
When I use:
make all ARCH=arm CROSS_COMPILE=arm-linux-
It said:
System not configured - see README
make: ***[all] Error 1

I had see README ,but my English is pool,I can't understand......

Can you tell me why?
Thanks very much!

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Have a nice weekend. Thanks,

Shinya Kuribayashi
NEC Electronics