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macOS Mojave にアップデートしたら stdio.h がないって言われた

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macOS を Mojave (10.14) にアップデートして、C 拡張つきの gem をコンパイルしようとしたら stdio.h がないよってエラーがでた。

いろいろ調べたら、Xcode 10 から、デフォルトでは /usr/include にヘッダファイルを置いてくれないらしい。

/Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg を実行すると /usr/include にコピーしてくれるのでこれで解決した。

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