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David Gobbi authored
For builds from tarballs, if the user turned on VTK_BUILD_TESTING, cmake used to silently turn it off because the default location for downloading external data, SOURCE_DIR/.ExternalData, exists in the VTK git repository, but not in the release tarballs. After this commit, if SOURCE_DIR/.ExternalData is missing and if there is no ExternalData or VTKExternalData directory, then cmake raises a FATAL_ERROR and asks the user to download the VTKData tarball, which contains the .ExternalData directory.
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