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I am not sure about your use case but in CMake you can try to find catkin and then continue based on if it was found or not. Like this:

find_package(catkin)
if(catkin_FOUND)
  ..
else()
  ..
endif()

You can also mix this with a custom option like COMPILE_WITH_CATKIN.

I am not sure about your use case but in CMake you can try to find catkin and then continue based on if it was found or not. Like this:

find_package(catkin)
find_package(catkin)  # not passing REQUIRED
if(catkin_FOUND)
  # maybe call find_package again with COMPONENTS
  ..
else()
  ..
endif()

You can also mix this with a custom option like COMPILE_WITH_CATKIN.