Did you really not forgot to put libDATlib.a file from DATlib\NeoDev\m68k\lib directory to m68k\lib directory of your SDK, and also move DATlib.h and input.h from DATlib\NeoDev\m68k\include to your SDK includes folder by analogical way, and after all to replace old common_crt0_(cart/cd).s and crt0_(cart/cd).s in your project folder with same named files from DATlib\startup headers folder?