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It defines how an application interacts with itself, how an application interacts with the kernel, and how an application interacts with libraries. A bit more context from tensorflow lite documentation The common explanation for not fixing some issues with c++ is that it would break the abi and require recompilation, but on the other hand i encounter statements like this

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An abi is a mapping from the execution model of the language to a particular machine/operating system/compiler combination

It makes no sense to define one in the language specification because that runs the risk of excluding c implementations on some architectures.

This is a case where your matrix package is too old The version number you give in the title is an rstudio version number, which isn't useful here If possible you should update the matrix package to 1.7.0 However, you can only do this if you're running r version 4.4

Otherwise, you should reinstall lme4 from source, or from a repository with a consistently built binary matrix / lme4 stack. This is used for calling c library (libc) functions on linux from assembly Although changes which mandate abi breaking changes are sometimes introduced, the case has to be argued a lot stronger than changes which don't affect anything Unless the benefit of the change outweights the reported potential of breaking some vendor's abi it won't be done.