provide private sqrt() or mandate -lm ?

[DBJDBJ]

https://godbolt.org/z/EfEvq6nh3

Please see that Godbolt.

For well-known reasons linker complains and compilation is not done linker complains sqrt() can not be found, thus '-lm' is required.

yes I know this is C only a Linux issue. I added some sqrt() implementation and that code links ok, with no -lm linker requirement "drama".

This seems like an easy way out ...