This is not a problem of argon, its a problem of properly escaping pathes.

I meant argon2_elixir, not argon.

It seems to me that this is an issue the argon2_elixir developer should be informed about (once I actually confirm what we all suspect), don’t you think?

Yes. They need to use ~ts instead of ~s when printing strings in a unicode environment.

In Makefile.auto.win there will be the full exit reason.

When you exit Erlang/Elixir the full slogan is printed to stdout and then a truncated slogan is printed to stderr. Since argon seems to do a redirect to Makefile.auto.win of the output of stdout the error reason will be put in that file. Then when you the next time try to run that Makefile, you actually try to run the error which will not work.

So check what text is in the Makefile and fix whatever that problem is

This is not a problem of argon, its a problem of properly escaping pathes.

It would probably work if the content were properly quoted:

ERTS_INCLUDE_PATH="C:/Program Files/• Programming/Erlang/erts-10.5/include"

Though I have no clue where things needed to be changed to properly quote… The easier way is in fact to move to a place where there are no spaces and no non-ascii characters in the location.