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https://edonymu.com/2017/06/11/gcc%e4%b8%ad%e7%9a%84%e7%8e%af%e5%a2%83%e5%8f%98%e9%87%8flibrary_path%e5%92%8cld_library_path/
GCC中的环境变量LIBRARY_PATH和LD_LIBRARY_PATH