@ -2516,6 +2516,12 @@ bool CDriverGL::isActive()
# warning "OpenGL Driver: Missing Mac Implementation for isActive (always true if a window is set)"
#elif defined (NL_OS_UNIX)
// check if our window is still active
XWindowAttributes attr;
Status status = XGetWindowAttributes(_dpy, _win, &attr);
nlwarning("XGetWindowAttributes returned %d", status);
#endif // NL_OS_UNIX
return res;