Comment author: @xavierleroy

Well, the cause of your symptom is that OCaml's native-code compiler does not have a code generator for the architecture you're using (IBM S/390, right?). The "configure" script mentioned that in the report it prints at the end. As written in the INSTALL file, step 4, in this situation you should stop at "make world", skip "make opt" and "make opt.opt", and go straight to "make install".

Now, to handle this report, I'd like to know what you are complaining about, exactly:

1- That S/390 is not supported by OCaml's native compiler? There is very little chance that this will ever happen, given that you are the first to ask and that we don't have access to a S/390 machine. You might, however, be able to contract with a service company to have a S/390 code generator developed specially for you.

2- That the error reported by "make opt" could be clearer? This I can agree with, but it's definitely not a major issue.

Sincerely,

• Xavier Leroy