Ah, I think I see your point. The configure.ac script has no code for "ac_cv_cflags_warn_all". But I can't run 'autoconf' myself again bash-4.4$ autoconf configure.ac configure.ac:33: error: Autoconf version 2.69 or higher is required -- Sent from: http://forum.world.st/Squeak-VM-f104410.html