Adding xkbcommon as a BuildRequires
    
    While doing the kf6 version of this package, I found that xkbcommon is a recommended package to build it. It works without it, but this showed:

    

    -- The following OPTIONAL packages have not been found:

     * XKB (required version >= 0.5.0), XKB API common to servers and clients., <http://xkbcommon.org>