void prop_set32(Window win, Atom prop, Atom type, gulong val);
void prop_set_array32(Window win, Atom prop, Atom type, gulong *val,
guint num);
-void prop_set_string_utf8(Window win, Atom prop, gchar *val);
+void prop_set_string_utf8(Window win, Atom prop, const gchar *val);
void prop_set_strings_utf8(Window win, Atom prop, gchar **strs);
void prop_erase(Window win, Atom prop);