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jcfr authored
COMP: CMakeLists.txt - Update cmake macro downloadFile to check if the file is empty and attempt re-download if needed This macro is mainly used to download FindCTK.cmake from the commontk github repository. git-svn-id: http://svn.slicer.org/Slicer4/trunk@13895 3bd1e089-480b-0410-8dfb-8563597acbee
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