[oe] What is `PE` used for?

[Paul Menzel]

Dear OE folks,


in [1] there is »PE = "1"«.

I could not find `${PE}` in the user manual and searching for »"${pe}
openembedded« did not work either.


Thanks,

Paul


[1] http://cgit.openembedded.org/cgit.cgi/openembedded/tree/recipes/gimp/babl_git.bb#n7
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