quack.h
// quack.h: an interface definition for a queue/stack
include <stdio.h>
include <stdlib.h>
typedef struct node *Quack;
Quack createQuack( ......
sudo apt-get mit-scheme;
run "scheme" then you enter the command line scheme repl;
sudo apt-get emacs;
modify "(setq scheme-program-name "scm")" in .e ......