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Now that you have the full Cmakelists, I'd put $1 that your issue is here

catkin_package(
#  INCLUDE_DIRS include
#  LIBRARIES learning_tf
#  CATKIN_DEPENDS roscpp rospy tf turtlesim
#  DEPENDS system_lib
)

You should read that snippet above here and try to understand what this is doing. To get you going, you need to uncomment the CATKIN_DEPENDS and probably the INCLUDE_DIRS lines.