screen_colormap = DefaultColormap(dpy, DefaultScreen(dpy));
XAllocNamedColor(dpy, screen_colormap, "yellow", &yellow, &yellow);
xgcv.foreground = yellow.pixel;
xgcv.fill_style = FillStippled;
xgcv.fill_rule = WindingRule;
xgcv.join_style = JoinRound;
gc1 = XCreateGC(dpy, win, GCForeground, &xgcv);
ca ca marche pas...pttt!