Wrong. It's open to Classic Amiga developer with OS3.9 and NDK and cross-compiler.
From the website:-
If your program is based on an OS3 program or an Open Source one, you can't just recompile the software for OS4.
How should I code?
Use OS4-specific features (hooks, reaction classes, vitualised memory...etc). It means you must use Reaction.
Use OS4 newlib runtime library
How exactly are you supposed to develop, test, and debug an application which only runs on OS4.0 on a OS3.9 system? Simple answer: You can't.
Yes, you can compile an OS4 binary with the cross-compiler but that's not much use if you can't run it.
I've used cross-compilers every day for five years in my job but I've always had the target platform (PS1, PS2, GC, XBox etc) sitting next to me or under my desk as well.
It's simply not possible to work without easy access to the platform you're developing for.
