Custom configuration in sketchbook folder -- how to use default arduino core?

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johnwasser:
Have you tried moving the file from

%Sketchbook%\hardware\arduino-addons\boards.txt

to

%Sketchbook%\hardware\boards.txt

Yes, I've tried. In that case only my boards.txt is processed (no default boards appear in menu in IDE).

johnwasser:
I also notice that some boards.txt files use the syntax:

atmega8noxtalfast.build.core=arduino:arduino

I'm not sure what that does but it might do what you want.

Such syntax (and my overall configuration) worked on the IDE versions (older than 1.0). For 1.0 it has to be separated to:

atmega8noxtalfast.build.core=arduino
atmega8noxtalfast.build.variant=standard