-void failed_assert(char *a, char *file, int line);
-void swap(void **p1, void **p2);
+extern void failed_assert(char *a, char *file, int line);
+extern void pipe_spawn(char *buf, unsigned int len, Display *dpy, char *argv[]);
+extern void spawn(Display *dpy, char *argv[]);
+extern void swap(void **p1, void **p2);
+extern unsigned int tokenize(char **result, unsigned int reslen,
+ char *str, char delim);