68k SDL should be declared illegal 
There is plenty of people who already are spending lots of time to making SDL ports to 68k amigas, that just....
If they instead making 5 SDL ports, could make 1 native port, that would be much better.
And this is not actually codin, this about "how sdl is useless for 68k amigas"
SDL proved to be quite useful for me for doing the reverse - porting my 68K native Amiga games to SDL then compiling them with ease on AmigaOS 4, MacOS X and Windows. If it wasn't for SDL then I probably would not go with the hassle to learn about MacOS and Windows coding, but now I still code on my Amiga and then recompile my games on other machines.
So, if I am going to write something serious for 68K Amigas, I will most probably do it in SDL to be able to easily port it on other machines, than having to rewrite it for SDL in later stages.