The problem is, as Kovid said, with the Qt packages which went through a API changing transition. That meant, that all packages need to be updated.
I have no idea about raspian inner workings, but a simple recompile of the current package from the current sources should suffice, since I didn't add any versioned dependencies.
This has nothing to do neither with Calibre upstream, nor with Calibre as in Debian, but simple package managing and necessity when compiling against system installed libraries that get updated.
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