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/usr/share/X11/xkb/compat/olpc is in xkb-data 2.5-1ubuntu1.

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

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);
    };
};