/usr/include/ is in libvtkgdcm2-dev 2.6.6-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gdcm-2.6/
/usr/include/gdcm-2.6/vtkGDCMImageReader.h
/usr/include/gdcm-2.6/vtkGDCMImageReader2.h
/usr/include/gdcm-2.6/vtkGDCMImageWriter.h
/usr/include/gdcm-2.6/vtkGDCMMedicalImageProperties.h
/usr/include/gdcm-2.6/vtkGDCMPolyDataReader.h
/usr/include/gdcm-2.6/vtkGDCMPolyDataWriter.h
/usr/include/gdcm-2.6/vtkGDCMTesting.h
/usr/include/gdcm-2.6/vtkGDCMThreadedImageReader.h
/usr/include/gdcm-2.6/vtkGDCMThreadedImageReader2.h
/usr/include/gdcm-2.6/vtkImageColorViewer.h
/usr/include/gdcm-2.6/vtkImageMapToColors16.h
/usr/include/gdcm-2.6/vtkImageMapToWindowLevelColors2.h
/usr/include/gdcm-2.6/vtkImagePlanarComponentsToComponents.h
/usr/include/gdcm-2.6/vtkImageRGBToYBR.h
/usr/include/gdcm-2.6/vtkImageYBRToRGB.h
/usr/include/gdcm-2.6/vtkLookupTable16.h
/usr/include/gdcm-2.6/vtkRTStructSetProperties.h