You simply started something compiled with an older Qt lib.
After some updates wether restart your desktop or pc if this dies not help...

Am 28. Mai 2020 22:11:46 MESZ schrieb james <garftd@verizon.net>:
>comrades,
>
>Pdfs are becoming a challenge to print. I'm sure I'll be printing pdf 
>files for decades to come.
>
>So what application/strategy gets me past errors like this:
>
>"Cannot mix incompatible Qt library (version 0x50e01) with this library
>
>(version 0x50e02)"
>
>
>Not being able to print pdf files is simply a no-go for me. I have no 
>intention of converting 10K+ pdf files to another format...
>
>Suggestions are most welcome, as what I have google-read, it's a mess 
>and I'm no closer to a gentoo centric solution.
>
>
>James

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