void XSetForeground(Display *, GC, unsigned long);
void XDrawLine(Display *, Drawable, GC, int, int, int, int);
void XDestroyImage(XImage *);
void XSetForeground(Display *, GC, unsigned long);
void XDrawLine(Display *, Drawable, GC, int, int, int, int);
void XDestroyImage(XImage *);