Some years ago we used a different environment and constantly called functions from the conio library. Only afterwards did I learn that it wasn't standard and that a lot of environments don't support it.
Thing is, I tried running a couple of those old programs in Pelles C, and sure enough, I get "missing prototype" errors for all of conio's functions (textbackground, getch, gotoxy...) despite having included <conio.h>, and despite conio.h being there in the PellesC\Include folder. I really don't know how to manage libraries; is there a way I could use conio?