I think this kind of request needs to be done here: please remove the binary libqt6core5compat6-dev 6.3.1-2~bpo11+1 from bullseye-backports. This binary package is no longer built by src:qt6--5compat, superseded by qt6-5compat-dev. libqt6core5compat6-dev | 6.3.1-2~bpo11+1 Thanks in advance, Lisandro.
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