The package pthreads provides CMake targets:

    find_package(pthreads REQUIRED)
    
    target_link_libraries(main PRIVATE PThreads4W::PThreads4W)
    #or
    target_link_libraries(main PRIVATE PThreads4W::PThreads4W_CXXEXC)
    #or
    target_link_libraries(main PRIVATE PThreads4W::PThreads4W_STRUCTEXC)