Rename macro "ctk_include_once" into "superbuild_include_once"
To update external project files living in your
fork of ExternalProjectsContrib, the ExternalProject migration guide
has been written to help you transition.
See http://www.commontk.org/index.php/Documentation/MigrationGuide/ExternalProject
See #418
Jean-Christophe Fillion-Robin%!s(int64=11) %!d(string=hai) anos