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MacでCatalinaにOSアップデートするとincludeでwchar.hなどが見つからなくなった

C++XcodemacOSCatalina

OSアップデート後コンパイルが通らなくなりました
エラー文
/usr/local/Cellar/gcc@4.9/4.9.4_1/include/c++/4.9.4/wchar.h:119:24: fatal error: wchar.h: No such file or directory
#include_next
などなど・・
以前にも同様のエラーが発生したことがあるのですが
ネットに載っている方法（gcc再インストールやxcode再インストールなど）
ではうまくいきませんでした
ディレクトリ4.9.4にwchar.hなどヘッダーファイルはあるんですがコンパイルできないです
どうしてでしょうか？

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yukiOjar
@yukiOjar
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