# file(CREATE_SYMLINK) only works on Windows with administrator privileges. https://stackoverflow.com/a/61244115/618906
function (create_symbolic_link target link)
    if (WIN32)
        if (NOT IS_SYMLINK "${link}")
            if (NOT IS_ABSOLUTE "${target}")
                # Relative links work do not work on Windows.
                set(target "${link}/../${target}")
            endif ()
            file(TO_NATIVE_PATH "${target}" target)
            file(TO_NATIVE_PATH "${link}" link)
            execute_process(COMMAND cmd.exe /c mklink /J "${link}" "${target}")
        endif ()
    else ()
        file(CREATE_LINK "${target}" "${link}" SYMBOLIC)
    endif ()
    if (NOT IS_SYMLINK "${link}")
        message(ERROR "failed to create symlink: <${link}>")
    endif ()
endfunction ()