Please ask such questions on
http://answers.ros.org following the support guidelines:
http://wiki.ros.org/Support.
ROS Discourse is for news and general interest discussions. ROS Answers provides a forum which can be filtered by tags to make sure the relevant people can find and/or answer the question, and not overload everyone with hundreds of posts.
Additionally, when you ask questions be sure to include as much information as possible. In this case that would include your `CMakeLists.txt` file.
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