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error #20 identifier "xx" is undefined



如图错误如何解决啊?这些关于FFT的数据类型的路径已经包含了的啊,奇怪的是,在用这些变量进行定义的时候没有报错,而在其他的头文件中用extern在对定义的的变量申明时报如下错误。