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我只是为了我的Xcode项目添加PJSIP的库和框架，如模拟器，设备和第三方，但是当我建立我的项目，它显示错误：未定义的符号
Undefined symbols for architecture armv7:
"_pjmedia_get_video_format_info", referenced from:
_ios_factory_create_stream in libpjmedia-videodev-arm-apple-darwin9.a(ios_dev.o)
"_pjmedia_format_get_video_format_detail", referenced from:
_ios_factory_create_stream in libpjmedia-videodev-arm-apple-darwin9.a(ios_dev.o)
"_pjmedia_format_init_video", referenced from:
_ios_factory_init in libpjmedia-videodev-arm-apple-darwin9.a(ios_dev.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
我试着谷歌的解决方案，但它似乎没有帮助。请分享你的想法，我想我想念一些配置或图书馆。提前致谢。