Qt 6.12 LTS is out! See what's new in the release
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QT Declarative failed to cross compile on QT 6.3.0
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GLIBC_2.30 version is not available. Try to upgrade glibc. Or you download the source and build it by yourself.
https://benohead.com/blog/2015/01/28/linux-check-glibc-version/