IF(GATE_USE_RTK OR GATE_USE_ITK)
SET(ITK_MINIMAL_VERSION 4.9)
SET(ITK_COMPONENTS ITKIOImageBase;ITKIOGDCM;ITKThresholding;ITKFFT;ITKImageCompose;ITKSmoothing)
You are not enabling ITKIOMeta
in the set of ITK_COMPONENTS
Add it:
SET(ITK_COMPONENTS ITKIOImageBase;ITKIOGDCM;ITKIOMeta;ITKThresholding;ITKFFT;ITKImageCompose;ITKSmoothing)