Makefile asking for mrproper on new checkout with KBUILD_OUTPUT

[Boaz Harrosh]

I get this problem: When a few Header files are changed, like when doing
a git checkout the Makefile is complaining about mrproper needed.

Now I'm building a:
	make ARCH=arch KBUILD_OUTPUT=.build_arch/

But a: 
	make ARCH=arch KBUILD_OUTPUT=.build_arch/ mrproper

Will not help. What the Makefile wants is a:
	make mrproper

doing the "make mrproper" does solves it.
It used to be fine, I'm not sure when it started to break.

How can I debug this to see what is the offending files?

Thanks
Boaz

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