编译失败麻烦老师帮忙看下吧 Undefined symbols for architecture x86

编译失败麻烦老师帮忙看下吧 Undefined symbols for architecture x86_64

来源：8-3 实战音频重采样2

Kincaid

2020-05-07

李超老师好,
我用的
8-3 完成后,编译,我这里提示:

Undefined symbols for architecture x86_64:
"_swr_alloc_set_opts", referenced from:
_rec_audio in testc.o
"_swr_convert", referenced from:
_rec_audio in testc.o
"_swr_free", referenced from:
_rec_audio in testc.o
"_swr_init", referenced from:
_rec_audio in testc.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

没整明白, 麻烦您帮忙看下吧

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