New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/issues/48758#issuecomment-1951740377

Comment:
Thus, I think in order to have  `-Werror=implicit-function-declaration -Werror=implicit-int`, we need:
- Update autoconf to latest version
- `gnu-configure`'s `do_configure` need `autoreconf -fi`