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Yes; you should be adding to the CMakeLists from the previous tutorial.

You shouldn't be trying to combine multiple statements from the different tutorials.

For example, each call to add_executable() in cmake defines a new executable that you're trying to compile, and you want to compile each tutorial, so you should have two separate calls to add_executable()

Your final CMakeLists should look something like:

cmake_minimum_required(VERSION 2.8.3)
project(learning_actionlib)

find_package(catkin REQUIRED COMPONENTS roscpp actionlib actionlib_msgs)
find_package(Boost REQUIRED COMPONENTS system)

add_action_files(
  DIRECTORY action
  FILES Fibonacci.action
)

generate_messages(
  DEPENDENCIES actionlib_msgs std_msgs
)

catkin_package(
  CATKIN_DEPENDS actionlib_msgs
)

include_directories(include ${catkin_INCLUDE_DIRS} ${Boost_INCLUDE_DIRS})

add_executable(fibonacci_server src/fibonacci_server.cpp)

target_link_libraries(
  fibonacci_server
  ${catkin_LIBRARIES}
)

add_dependencies(
  fibonacci_server
  ${learning_actionlib_EXPORTED_TARGETS}
)

add_executable(fibonacci_client src/fibonacci_client.cpp)

target_link_libraries( 
  fibonacci_client
  ${catkin_LIBRARIES}
)

add_dependencies(
  fibonacci_client
  ${learning_actionlib_EXPORTED_TARGETS}
)