[yocto] How to find the source of a variable value?

[Paul D. DeRocco]

This image recipe has some Python that complains because "x11" is in
DISTRO_FEATURES. How do I find out where that "x11" is coming from? This
is a Gumstix build, so I suspect it's indirectly related to my selecting
"overo" as the MACHINE, because otherwise building this image would never
have worked with the plain Yocto meta-data. So how do I track this down?

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Ciao,               Paul D. DeRocco
Paul                mailto:pderocco at ix.netcom.com