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It seems to me that you don't link to OpenCV. Do this by adding the following line to your CMakeLists.txt

find_package(OpenCV REQUIRED)

And you might also need to link your executable/library to it

target_link_libraries(your_target ${OpenCV_LIBS})

It seems to me that you don't link to OpenCV. Do this by adding the following line to your CMakeLists.txt

find_package(OpenCV REQUIRED)

And you might also need to link your executable/library to it

target_link_libraries(your_target ${OpenCV_LIBS})

In your case change

 target_link_libraries(color_to_gray_node ${catkin_LIBRARIES})

for

 target_link_libraries(color_to_gray_node ${catkin_LIBRARIES} ${OpenCV_LIBS} )