cocos2d-x - cocos2d-x 3.15 をビルドするときの Apple Mach-O リンカ エラー: "_iconv_open"、次から参照: cocos2d::FontAtlas::conversionU32TOGB2312()

Question

既存の cocos2d-x プロジェクトを 3.7 から 3.15 に更新しようとしていますが、次のリンカー エラーが発生します。

    Undefined symbols for architecture arm64:
  "_iconv_open", referenced from:
      cocos2d::FontAtlas::conversionU32TOGB2312(std::__1::basic_string<char32_t, std::__1::char_traits<char32_t>, std::__1::allocator<char32_t> > const&, std::__1::unordered_map<unsigned int, unsigned int, std::__1::hash<unsigned int>, std::__1::equal_to<unsigned int>, std::__1::allocator<std::__1::pair<unsigned int const, unsigned int> > >&) in libcocos2d iOS.a(CCFontAtlas.o)
  "_iconv", referenced from:
      cocos2d::FontAtlas::conversionU32TOGB2312(std::__1::basic_string<char32_t, std::__1::char_traits<char32_t>, std::__1::allocator<char32_t> > const&, std::__1::unordered_map<unsigned int, unsigned int, std::__1::hash<unsigned int>, std::__1::equal_to<unsigned int>, std::__1::allocator<std::__1::pair<unsigned int const, unsigned int> > >&) in libcocos2d iOS.a(CCFontAtlas.o)
  "_CTFramesetterCreateWithAttributedString", referenced from:
      _calculateShrinkedSizeForString(NSAttributedString**, objc_object*, CGSize, bool, int&) in libcocos2d iOS.a(CCDevice-ios.o)
  "_iconv_close", referenced from:
      cocos2d::FontAtlas::~FontAtlas() in libcocos2d iOS.a(CCFontAtlas.o)
  "_CTFramesetterSuggestFrameSizeWithConstraints", referenced from:
      _calculateShrinkedSizeForString(NSAttributedString**, objc_object*, CGSize, bool, int&) in libcocos2d iOS.a(CCDevice-ios.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

これを解決するために何をすべきかについて何か考えはありますか?

Xcode 9.0 でビルドする

ありがとう！