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The CMakeLists.txt of the caller_pkg has a typo, this:

  target_link_libraries(main2
  ${catkin_LIBRARIES}
  ${lib_test_INCLUDE_DIRS}
  )

Should use lib_test_LIBRARIES instead:

  target_link_libraries(main2
  ${catkin_LIBRARIES}
  ${lib_test_LIBRARIES}
  )

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