Specified SDKMACHINE value is not valid


I'm trying an experiment building yocto/OE on a Raspberry Pi 4 to host on the same RP4. Admittedly, a not practical platform for this purpose but it should work.

I'm trying to target the ARM ISA for the image using yocto-3.4.2. I've tried simply using the default setting and end up with:
ERROR:  OE-core's config sanity checker detected a potential misconfiguration.
    Either fix the cause of this error or at your own risk disable the checker (see sanity.conf).
    Following is the list of potential problems / advisories:
    Specified SDKMACHINE value is not valid

I've tried editing ./conf/local.conf:

MACHINE ?= "qemuarm64"

#MACHINE ??= "qemux86-64"

But this accomplishes nothing. Needless to say, I'm a yacto/OE newbie, so any suggestions would be greatly appreciated.


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