// 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 "itkOptMattesMutualInformationImageToImageMetricFor3DBLUTFFD.txx"
#else
#include "itkImageRegionIterator.h"
#include "itkImageIterator.h"
#include "vnl/vnl_math.h"
-#if ITK_VERSION_MAJOR >= 4
- #include "itkBSplineTransform.h"
-#else
- #include "itkBSplineDeformableTransform.h"
-#endif
+#include "itkBSplineDeformableTransform.h"
namespace itk
{