oscpack can be used from CMake via:

    find_path(OSCPACK_INCLUDE_DIRS "osc" PATH_SUFFIXES "oscpack")
    find_library(OSCPACK_LIBRARY oscpack REQUIRED)
    target_include_directories(main PRIVATE ${OSCPACK_INCLUDE_DIRS})
    target_link_libraries(main PRIVATE ${OSCPACK_LIBRARY})
    
In case of Windows static link in addition: 

    target_link_libraries(main PRIVATE ws2_32 winmm)