Get single keystroke?

[Sean Eskapp]

== Quote from Andrej Mitrovic (andrej.mitrovich at gmail.com)'s article
> Here's something simpler:
> import std.stdio : writefln;
> extern(C) int kbhit();
> extern(C) int getch();
> void main()
> {
>     while(!kbhit())
>     {
>         // keep polling
>         // might use thread.sleep here.
>     }
>     writefln("Key hit was %s.", getch());
> }

What extra linker dependencies does this add?