...reater visibility than the type of its field ‘itk::DiffusionTensor3DRead::m_Reader’
See comments: https://github.com/Slicer/Slicer/pull/121 Due to the fact that itkDiffusionTensor3DRead was declaring a private variable of type itkImageFileReader::Pointer and that this class was declared with ITK_ABI_EXPORT, we had to add ITK_ABI_EXPORT to the declaration of itkDiffusionTensor3DRead to remove the previously described warning when ResampleDTIVolume was compiled (shared object).