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/usr/share/X11/xkb/compat/olpc is in xkb-data 2.23.1-1ubuntu1.

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//
// Map the OLPC game keys to virtual modifiers.
//
// Created by Bernardo Innocenti <bernie@codewiz.org>
//

default xkb_compatibility "olpc" {
    include "complete"

    virtual_modifiers  Square,Cross,Triangle,Circle;

    interpret KP_Home+Any {
        //useModMapMods= level1;
        virtualModifier= Square;
        action = SetMods(modifiers=modMapMods);
    };

    interpret KP_Home {
        action = SetMods(modifiers=Square);
    };

    interpret KP_Next+Any {
        //useModMapMods= level1;
        virtualModifier= Cross;
        action = SetMods(modifiers=modMapMods);
    };

    interpret KP_Next {
        action = SetMods(modifiers=Cross);
    };

    interpret KP_End+Any {
        //useModMapMods= level1;
        virtualModifier= Circle;
        action = SetMods(modifiers=modMapMods);
    };

    interpret KP_End {
        action = SetMods(modifiers=Circle);
    };

    interpret KP_Prior+Any {
        //useModMapMods= level1;
        virtualModifier= Triangle;
        action = SetMods(modifiers=modMapMods);
    };

    interpret KP_Prior {
        action = SetMods(modifiers=Triangle);
    };
};