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You missed adding ${catkin_INCLUDE_DIRS} to the include_directories, i.e. change

include_directories(include libpixyusb/include libpixyusb/common  ${LIBUSB_1_INCLUDE_DIRS})

for

include_directories(include libpixyusb/include libpixyusb/common  ${LIBUSB_1_INCLUDE_DIRS} ${catkin_INCLUDE_DIRS})

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