答: 说明编译器不支持此选项，那么在Makefile中替换此选项-std=gnu11
替换成-std=gnu99或-std=c99或-std=c11等，主要看编译器都支持哪些编译选项，笔者的支持-std=gnu99,
因此在Makefile中替换选项-std=gnu11为-std=gnu99
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