error：
linker command failed with exit code 1 (use -v to see invocation)
错误原因：libidn.a文件没添加上去
解决方法：libidn.a文件删除重新添加
第一步：删除libidn.a文件
第二步：添加libidn.a文件
在Finder中找到libidn.a文件
打开libidn.a文件
运行程序，问题就解决了
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