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gcc_termux
Gcc for termux with fortran scipy etc... Use apt for newest updates instructions in README.txt
If it used to work then you probably just need to reinstall(/recompile) it with something like pip3 install ocrmypdf --force. Most likely issue happens because some library it links against had a major upgrade, which caused the mentioned symbol to disappear (could also be a variant of https://github.com/android/ndk/issues/1614, but seems unlikely)
Looking at it again, issue is with qpdf rather than ocrmypdf. Should be fixed in qpdf version 10.6.3-2: https://github.com/termux/termux-packages/commit/694fdc8c98102f3bdbcd8fc260db70c7a3a60270