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<div>This is a problem that has been cropping up in our projects that use ITK, VTK and SlicerExecutionModel. </div>
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<div>You won’t see it UNLESS you turn on the ITKVTK/ITKVtkGlue modules.</div>
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<div>The problem is this: if you find packages in this order:</div>
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<div>find_package(VTK REQUIRED)</div>
<div>find_package(ITK REQUIRED)</div>
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<div>You can’t real compile anything that needs VTK, because down in the ITK deployment stuff, it calls find_package(VTK) like this:</div>
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<div>find_package(VTK COMPONENTS</div>
<div> vtkCommonCore</div>
<div> vtkRenderingCore</div>
<div> vtkRenderingOpenGL</div>
<div> vtkRenderingFreeType</div>
<div> vtkInteractionStyle</div>
<div> vtkIOImage</div>
<div> vtkImagingSources</div>
<div> REQUIRED)</div>
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<div>Which blows away the larger list of include directories and libraries that the first find_package(VTK REQUIRED) built.</div>
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<div>Even better — or worse — Modules/Segmentation/LevelSetsv4Visualization/CMakeLists.txt also include find_package(VTK) — so ITK tries to import VTK twice, with different module lists.</div>
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<div>It doesn’t even help to reverse the order:</div>
<div>find_package(ITK REQUIRED)</div>
<div>find_package(VTK REQUIRED)</div>
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<div>because apparently there’s some hangover from the find_package(VTK) inside the ITK CMake deployment files. The only thing that works is to use COMPONENTS, i.e.</div>
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<div>find_package(ITK REQUIRED)</div>
<div>find_package(VTK COMPONENTS vtkCommonCore vtkRenderingAnnotation … REQUIRED)</div>
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<div>Which seems to trigger a proper re-scan and build of the library/include lists.</div>
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<div>It gets even worse if you use find_package(SlicerExecutionModel) after find_package(ITK), for the same reason — SlicerExecutionModel depends on ITK, so it clobbers the include/library lists from the first find_package(ITK).</div>
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