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I was able to compile glibc 2.40, but it resulted in KP.
Could someone or two help connect the dots correctly?
Compiled glibc-2.40:
https://easyupload.io/123c9t
glibc is a core library that every application in the system uses. If you change the glibc version in a system there is a good chance many of the system programs may lose some functionality, do something unexpected or break.
If you need a different glibc version you should do a system upgrade to an operating system that supports the glibc version you wish to change to.