[Buildroot] How to regenerate zImage?

[Woody Wu]

After I made any small changes in kernel source, I can force the kernel
to be rebuilt by removing the .stamp_built under the
output/build/linux-version directory.  But, it's strange that the
output/zImage file always not get recreated or rebuilt.

How should I force the buildroot to regenerate the zImage file for me?
Thanks.

-- 
woody
I can't go back to yesterday - because I was a different person then.