Temporary header file '/tmp/nqx4n0XZFc/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/vtk-9.1/vtkDICOMAlgorithm.h"
  #include "/usr/include/vtk-9.1/vtkDICOMApplyPalette.h"
  #include "/usr/include/vtk-9.1/vtkDICOMApplyRescale.h"
  #include "/usr/include/vtk-9.1/vtkDICOMBuild.h"
  #include "/usr/include/vtk-9.1/vtkDICOMCTGenerator.h"
  #include "/usr/include/vtk-9.1/vtkDICOMCTRectifier.h"
  #include "/usr/include/vtk-9.1/vtkDICOMCharacterSet.h"
  #include "/usr/include/vtk-9.1/vtkDICOMCharacterSetTables.h"
  #include "/usr/include/vtk-9.1/vtkDICOMCompiler.h"
  #include "/usr/include/vtk-9.1/vtkDICOMConfig.h"
  #include "/usr/include/vtk-9.1/vtkDICOMDataElement.h"
  #include "/usr/include/vtk-9.1/vtkDICOMDictEntry.h"
  #include "/usr/include/vtk-9.1/vtkDICOMDictHash.h"
  #include "/usr/include/vtk-9.1/vtkDICOMDictPrivate.h"
  #include "/usr/include/vtk-9.1/vtkDICOMDictionary.h"
  #include "/usr/include/vtk-9.1/vtkDICOMDirectory.h"
  #include "/usr/include/vtk-9.1/vtkDICOMFile.h"
  #include "/usr/include/vtk-9.1/vtkDICOMFileDirectory.h"
  #include "/usr/include/vtk-9.1/vtkDICOMFilePath.h"
  #include "/usr/include/vtk-9.1/vtkDICOMFileSorter.h"
  #include "/usr/include/vtk-9.1/vtkDICOMGenerator.h"
  #include "/usr/include/vtk-9.1/vtkDICOMImageCodec.h"
  #include "/usr/include/vtk-9.1/vtkDICOMItem.h"
  #include "/usr/include/vtk-9.1/vtkDICOMLookupTable.h"
  #include "/usr/include/vtk-9.1/vtkDICOMMRGenerator.h"
  #include "/usr/include/vtk-9.1/vtkDICOMMetaData.h"
  #include "/usr/include/vtk-9.1/vtkDICOMMetaDataAdapter.h"
  #include "/usr/include/vtk-9.1/vtkDICOMModule.h"
  #include "/usr/include/vtk-9.1/vtkDICOMParser.h"
  #include "/usr/include/vtk-9.1/vtkDICOMReader.h"
  #include "/usr/include/vtk-9.1/vtkDICOMReferenceCount.h"
  #include "/usr/include/vtk-9.1/vtkDICOMSCGenerator.h"
  #include "/usr/include/vtk-9.1/vtkDICOMSequence.h"
  #include "/usr/include/vtk-9.1/vtkDICOMSliceSorter.h"
  #include "/usr/include/vtk-9.1/vtkDICOMSorter.h"
  #include "/usr/include/vtk-9.1/vtkDICOMTag.h"
  #include "/usr/include/vtk-9.1/vtkDICOMTagPath.h"
  #include "/usr/include/vtk-9.1/vtkDICOMToRAS.h"
  #include "/usr/include/vtk-9.1/vtkDICOMUIDGenerator.h"
  #include "/usr/include/vtk-9.1/vtkDICOMUtilities.h"
  #include "/usr/include/vtk-9.1/vtkDICOMUtilitiesUIDTable.h"
  #include "/usr/include/vtk-9.1/vtkDICOMVM.h"
  #include "/usr/include/vtk-9.1/vtkDICOMVR.h"
  #include "/usr/include/vtk-9.1/vtkDICOMValue.h"
  #include "/usr/include/vtk-9.1/vtkDICOMWriter.h"
  #include "/usr/include/vtk-9.1/vtkNIFTIHeader.h"
  #include "/usr/include/vtk-9.1/vtkNIFTIPrivate.h"
  #include "/usr/include/vtk-9.1/vtkNIFTIReader.h"
  #include "/usr/include/vtk-9.1/vtkNIFTIWriter.h"
  #include "/usr/include/vtk-9.1/vtkScancoCTReader.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/nqx4n0XZFc/dump1.h"

In file included from /tmp/nqx4n0XZFc/dump1.h:12:
/usr/include/vtk-9.1/vtkDICOMAlgorithm.h:27:10: fatal error: vtkThreadedImageAlgorithm.h: No such file or directory
   27 | #include "vtkThreadedImageAlgorithm.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.