// gets integrated into the main directories.
#include "itkConfigure.h"
-#ifdef ITK_USE_OPTIMIZED_REGISTRATION_METHODS
+#if defined(ITK_USE_OPTIMIZED_REGISTRATION_METHODS) || ITK_VERSION_MAJOR >= 4
#include "clitkOptNormalizedCorrelationImageToImageMetricFor3DBLUTFFD.h"
#else