extern int filter_vis(t_manager *man);
extern void set_sizes(t_manager *man,real sx,real sy);
-extern bool toggle_hydrogen(t_x11 *x11,t_molwin *mw);
+extern gmx_bool toggle_hydrogen(t_x11 *x11,t_molwin *mw);
/* Toggle the state of the hydrogen drawing,
* return the current state
*/