Not sure where that GL_NONE is supposed to be defined, so for now I just set it to 0
#define GL_NONE 0 // GL_NONE_OES
Next error is here:
void IPhoneGraphicsWindow::
close_window() {
// system_close_window();
WindowProperties properties;
properties.set_open(false);
system_changed_properties(properties);
// release_system_resources(false);
_gsg.clear();
[color=red]_active = false;
GraphicsWindow::close_window();
}
_active isn’t found so I replaced it with set_active(false)