Following [r27235](http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=27235), older version of OpenIGTLink project has been removed from Slicer. * Approach 1: To continue using the older version, the file `External_OpenIGTLink.cmake` should be added to this project * Approach 2: The SlicerOpenIGTLink extension could be bundled in this project. See [How to build Slicer bundling extensions ?](https://www.slicer.org/wiki/Documentation/Nightly/Developers/FAQ#How_to_build_Slicer_bundling_extensions_.3F) and [How are Superbuild extension packaged ?](https://www.slicer.org/wiki/Documentation/Nightly/Developers/FAQ#How_are_Superbuild_extension_packaged_.3F)
Following r27235, older version of OpenIGTLink project has been removed from Slicer.
Approach 1: To continue using the older version, the file
External_OpenIGTLink.cmakeshould be added to this projectApproach 2: The SlicerOpenIGTLink extension could be bundled in this project. See How to build Slicer bundling extensions ? and How are Superbuild extension packaged ?