ADD_ELXCOMPONENT( PatternIntensityMetric # Was OFF by default before elastix 5.0.1
 elxPatternIntensityMetric.h
 elxPatternIntensityMetric.hxx
 elxPatternIntensityMetric.cxx
 itkPatternIntensityImageToImageMetric.h
 itkPatternIntensityImageToImageMetric.hxx)