Linking issue with other ROS packages

[kubja]

The tts ROS package can't be "find_packaged" in other ROS packages as library tts is expected due to specification in catkin_package .

This is the error:

CMake Error at /opt/ros/melodic/share/tts/cmake/ttsConfig.cmake:173 (message):
  Project 'package_name' tried to find library 'tts'.  The
  library is neither a target nor built/installed properly.  Did you compile
  project 'tts'? Did you find_package() it before the subdirectory containing
  its code is included?

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