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catkin_make will automatically build all your CMake target in parallel. In your case you have to tell CMake that it must generate C++ code for the messages (BatteryState.h) before compiling p2osnode.cpp.

You do that by adding a dependency form the executable you are building to the gencpp target which generates the messages headers. Adding something like the following line to your CMakeLists.txt:

add_dependencies(<target_name_of_your_executable_or_library> <msg_pkg_name_containing_the_battery_state>_genpp)

See https://github.com/ros/ros_comm/blob/groovy-devel/clients/roscpp/CMakeLists.txt#L118 for an example

catkin_make will automatically build all your CMake target in parallel. In your case you have to tell CMake that it must generate C++ code for the messages (BatteryState.h) before compiling p2osnode.cpp.

You do that by adding a dependency form the executable you are building to the gencpp target which generates the messages headers. Adding something like the following line to your CMakeLists.txt:

add_dependencies(<target_name_of_your_executable_or_library> <msg_pkg_name_containing_the_battery_state>_genpp)

See https://github.com/ros/ros_comm/blob/groovy-devel/clients/roscpp/CMakeLists.txt#L118 for an example