message: build(ITKVtkGlue): Use the external repository
  Also specify VTK_RENDERING_BACKEND is None because there are missing
  symbols.
diff: @@ -19,22 +19,34 @@ RUN git clone https://github.com/thewtex/VTK.git && \
  -DCMAKE_INSTALL_PREFIX:PATH=/install-prefix \
  -DBUILD_EXAMPLES:BOOL=OFF \
  -DBUILD_TESTING:BOOL=OFF \
  + -DVTK_RENDERING_BACKEND:STRING=None \
  -DVTK_NO_PLATFORM_SOCKETS:BOOL=ON \
  ../VTK && \
  ninja -j7 && \
  find . -name '*.o' -delete && \
  cd .. && chmod -R 777 VTK-build
  -RUN cd /ITK-build && \
  +# 2019-01-27
  +ENV ITKVtkGlue_GIT_TAG 6f3cd6fd697ec19ee12b65041537594bf295c0ca
  +RUN git clone https://github.com/InsightSoftwareConsortium/ITKVtkGlue.git && \
  + cd ITKVtkGlue && \
  + git checkout ${ITKVtkGlue_GIT_TAG} && \
  + cd ../ && \
  + mkdir ITKVtkGlue-build && \
  + cd ITKVtkGlue-build && \
  cmake \
  - -DModule_ITKVtkGlue:BOOL=ON \
  - -DVTK_DIR=/VTK-build \
  - . && \
  + -G Ninja \
  + -DCMAKE_BUILD_TYPE:STRING=Release \
  + -DBUILD_SHARED_LIBS:BOOL=OFF \
  + -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE} \
  + -DCMAKE_INSTALL_PREFIX:PATH=/install-prefix \
  + -DITK_DIR:PATH=/ITK-build \
  + -DVTK_DIR:PATH=/VTK-build \
  + ../ITKVtkGlue && \
  ninja -j7 && \
  find . -name '*.o' -delete && \
  cd .. && chmod -R 777 ITK-build
  -
  # Build-time metadata as defined at http://label-schema.org
  ARG BUILD_DATE
  ARG IMAGE=kitware/itk-js-vtk
  