This is a known bug in macOS and Linux versions of QB64, which I only found out about after releasing version 1.3, which is why we don’t have a fix yet (it’s a two character addition to qb64.bas, but I haven’t gotten around to releasing it yet). A temporary workaround for me on the Mac was to make my qb64 folder part of the system “path”, which (I think) will also solve the issue temporarily on Linux.