I think the fix is simply that it needs to Build-Depends on libkchart-dev (which is currently version 3.0.1-4, and works with Qt 6) instead of libkchart2-dev (which is the Qt 5 version).
For background, see: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1095442 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1086478 -- Soren Stoutner [email protected]
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