Also, try the https://github.com/OpenSmalltalk/opensmalltalk-vm/tree/fix_include_order branch for the time being. Best regards -tobias > On 27. May 2021, at 20:04, Levente Uzonyi <leves at caesar.elte.hu> wrote: > > The VM uses clang instead of gcc. So, you need to install clang. > > > Levente