[Users] Error while compiling on macOS

[Leo]

> This should have been:
> ./configure CPPFLAGS='I/opt/homebrew/Cellar/gnutls/3.8.2/include'

I executed the above, which resulted in the attached config.log. This
might be a very relevant part:

configure:4395: checking whether the C
compiler works configure:4417: gcc
I/opt/homebrew/Cellar/gnutls/3.8.2/include conftest.c  >&5 clang:
error: no such file or directory:
'I/opt/homebrew/Cellar/gnutls/3.8.2/include' configure:4421: $? = 1
configure:4461: result: no
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