In a make file I have: INCLUDE_DIRECTORIES(${MY_PROJECT}/lib) INCLUDE_DIRECTORIES(${MY_PROJECT}/lib/CImg-1.21) INCLUDE_DIRECTORIES(${MY_PROJECT}/lib/revised) INCLUDE_DIRECTORIES(${MY_PROJECT}/lib/revised/io) Is it possible to just specify that everything inside ${MY_PROJECT}/lib should be included instead of manullay specifying each subfolder?