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Hi, I have a unity game which i am trying to export to iOS. The build was working fine until i had to integrate the following SDKs into my project. Facebook SDK Firebase (firestore, messaging, auth) Google ads My Xcode version is: 15.1 Build target: 12 i'm getting the following error in the logs while trying to build: Any help would be appreciated The error is Undefined symbols and linker command failed with exit code 1 (use -v to see invocation) with output ld: Undefined symbols: absl::lts_20220623::variant_internal::ThrowBadVariantAccess(), referenced from: firebase::firestore::nanopb::SharedMessage<firebase::firestore::_google_firestore_v1_Value>& absl::lts_20220623::variant_internal::TypedThrowBadVariantAccess<firebase::firestore::nanopb::SharedMessage<firebase::firestore::_google_firestore_v1_Value>&>() in libFirebaseCppFirestore.a[arm64][37](field_value_main.cc.o) firebase::firestore::DocumentReference const& absl::lts_20220623::variant_internal::TypedThrowBadVariantAccess<firebase::firestore::DocumentReference const&>() in libFirebaseCppFirestore.a[arm64][37](field_value_main.cc.o) std::__1::vector<firebase::firestore::FieldValue, std::__1::allocator<firebase::firestore::FieldValue>> const& absl::lts_20220623::variant_internal::TypedThrowBadVariantAccess<std::__1::vector<firebase::firestore::FieldValue, std::__1::allocator<firebase::firestore::FieldValue>> const&>() in libFirebaseCppFirestore.a[arm64][37](field_value_main.cc.o) std::__1::unordered_map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, firebase::firestore::FieldValue, std::__1::hash<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::__1::equal_to<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::__1::allocator<std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const, firebase::firestore::FieldValue>>> const& absl::lts_20220623::variant_internal::TypedThrowBadVariantAccess<std::__1::unordered_map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, firebase::firestore::FieldValue, std::__1::hash<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::__1::equal_to<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::__1::allocator<std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const, firebase::firestore::FieldValue>>> const&>() in libFirebaseCppFirestore.a[arm64][37](field_value_main.cc.o) firebase::firestore::nanopb::SharedMessage<firebase::firestore::_google_firestore_v1_Value> const& absl::lts_20220623::variant_internal::TypedThrowBadVariantAccess<firebase::firestore::nanopb::SharedMessage<firebase::firestore::_google_firestore_v1_Value> const&>() in libFirebaseCppFirestore.a[arm64][37](field_value_main.cc.o) absl::lts_20220623::optional_internal::throw_bad_optional_access(), referenced from: absl::lts_20220623::optional<firebase::firestore::_google_firestore_v1_Value>::value() && in libFirebaseCppFirestore.a[arm64][35](document_snapshot_main.cc.o) absl::lts_20220623::optional<firebase::firestore::model::Document>::value() const & in libFirebaseCppFirestore.a[arm64][40](query_main.cc.o) absl::lts_20220623::optional<std::__1::vector<firebase::firestore::DocumentChange, std::__1::allocator<firebase::firestore::DocumentChange>>>::value() & in libFirebaseCppFirestore.a[arm64][41](query_snapshot_main.cc.o) absl::lts_20220623::optional<std::__1::vector<firebase::firestore::DocumentSnapshot, std::__1::allocator<firebase::firestore::DocumentSnapshot>>>::value() & in libFirebaseCppFirestore.a[arm64][41](query_snapshot_main.cc.o) absl::lts_20220623::optional<std::__1::unordered_set<firebase::firestore::FieldPath, std::__1::hash<firebase::firestore::FieldPath>, std::__1::equal_to<firebase::firestore::FieldPath>, std::__1::allocator<firebase::firestore::FieldPath>>>::value() const & in libFirebaseCppFirestore.a[arm64][43](user_data_converter_main.cc.o) firebase::firestore::api::AggregateQuery::Get(std::__1::function<void (firebase::firestore::util::StatusOr<long long> const&)>&&), referenced from: firebase::firestore::AggregateQueryInternal::Get(firebase::firestore::AggregateSource) in libFirebaseCppFirestore.a[arm64][29](aggregate_query_main.cc.o) firebase::firestore::api::operator==(firebase::firestore::api::AggregateQuery const&, firebase::firestore::api::AggregateQuery const&), referenced from: firebase::firestore::operator==(firebase::firestore::AggregateQueryInternal const&, firebase::firestore::AggregateQueryInternal const&) in libFirebaseCppFirestore.a[arm64][29](aggregate_query_main.cc.o) firebase::firestore::operator==(firebase::firestore::AggregateQuerySnapshotInternal const&, firebase::firestore::AggregateQuerySnapshotInternal const&) in libFirebaseCppFirestore.a[arm64][30](aggregate_query_snapshot_main.cc.o) firebase::firestore::api::Query::Count() const, referenced from: firebase::firestore::QueryInternal::Count() in libFirebaseCppFirestore.a[arm64][40](query_main.cc.o) firebase::firestore::core::Query::normalized_order_bys() const, referenced from: firebase::firestore::QueryInternal::ToBound(firebase::firestore::QueryInternal::BoundPosition, firebase::firestore::DocumentSnapshot const&) const in libFirebaseCppFirestore.a[arm64][40](query_main.cc.o) firebase::firestore::QueryInternal::ToBound(firebase::firestore::QueryInternal::BoundPosition, firebase::firestore::DocumentSnapshot const&) const in libFirebaseCppFirestore.a[arm64][40](query_main.cc.o) firebase::firestore::QueryInternal::ToBound(firebase::firestore::QueryInternal::BoundPosition, firebase::firestore::DocumentSnapshot const&) const in libFirebaseCppFirestore.a[arm64][40](query_main.cc.o) vtable for firebase::firestore::api::AggregateQuery, referenced from: firebase::firestore::api::AggregateQuery::AggregateQuery(firebase::firestore::api::AggregateQuery const&) in libFirebaseCppFirestore.a[arm64][2](aggregate_query.cc.o) firebase::firestore::api::AggregateQuery::~AggregateQuery() in libFirebaseCppFirestore.a[arm64][2](aggregate_query.cc.o) clang: error: linker command failed with exit code 1 (use -v to see invocation)