当我尝试构建时出现此错误。我已经更新了我的 pod，但没有解决。
"Undefined symbols for architecture arm64:
"_xmlXPathFreeObject", referenced from:
lxml::xpath::object::object(_xmlXPathObject*) in FBAudienceNetwork(FNFMediaPresentationDescription.mm.o)
"_xmlReadMemory", referenced from:
lxml::xml::xml(void const*, unsigned long, char const*, char const*, int) in FBAudienceNetwork(FNFMediaPresentationDescription.mm.o)
"___xmlLastError", referenced from:
lxml::xml::xml(void const*, unsigned long, char const*, char const*, int) in FBAudienceNetwork(FNFMediaPresentationDescription.mm.o)
"_xmlXPathCastToBoolean", referenced from:
lxml::xpath::object::boolean() in FBAudienceNetwork(FNFMediaPresentationDescription.mm.o)
"_xmlXPathCastToString", referenced from:
lxml::xpath::object::string() in FBAudienceNetwork(FNFMediaPresentationDescription.mm.o)
"_xmlFreeDoc", referenced from:
lxml::xml::xml(void const*, unsigned long, char const*, char const*, int) in FBAudienceNetwork(FNFMediaPresentationDescription.mm.o)
"_xmlXPathFreeContext", referenced from:
+[FNFMediaPresentationDescription presentationDescriptionWithContentsOfXml:mpdUrl:error:] in FBAudienceNetwork(FNFMediaPresentationDescription.mm.o)
"_xmlXPathCompile", referenced from:
lxml::xpath::expression::expression(char const*) in …