There is even a better alternative; just use the Oberon+ toolchain (compatible with Oberon 87, Oberon-2 and Oberon-07), so you can benefit of a decent IDE with

There is even a better alternative; just use the Oberon+ toolchain (compatible with Oberon 87, Oberon-2 and Oberon-07), so you can benefit of a decent IDE with a source-level debugger and a C99 transpiler.