@robo-ant
Welcome.
I'm so used to modern C++ compilers with STL, boost, etc., that I'm not sure I'd have much patience for anything less now. :-/
Amiga OS4 has the gcc C/C++ compiler in the freely downloadable SDK (including STL). BOOST is also available so you've got everything you need. Likewise there's SDL and FLTK too if you want to use them.
Hans
