wrong notice in `./configure`

I'm running Ubuntu using multipass on a Macbook M2 Pro machine. When running ./configure, it shows:

 IMPORTANT NOTICE: build platform is not GNU/Linux
 --------------------------------------------------

 SYSeg source code examples were originally developed in GNU/Linux,
 and it seems you are building it on a different OS (linux-gnu).

 In principle, SYSeg examples should work in any POSIX compliant
 operating system, but this has not been systematically tested.
 If your OS supports a POSIX runtime, you are safe to go; just bear
 this notice in mind. If you have any trouble trying SYSeg in a
 non GNU/Linux system, you are encouraged to report (if possible,
 by opening and issue at the repository).

Does it seem a mismatch between OS and arch?