This is not due to autoconf. It's faster than the `make` command, i.e. after autoconf has generated everything. Building the tests, in particular is instant wi

This is not due to autoconf. It's faster than the `make` command, i.e. after autoconf has generated everything. Building the tests, in particular is instant with zig, not with make. It may still be autoconf, but not the configure phase, rather the complexity of the generated makefiles.