macOS mkmf.rb can't find header files for ruby

  1. sudo rm -rf /Library/Developer/CommandLineTools
  2. xcode-select –install
  3. sudo xcodebuild -license accept
  4. open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg

Ref: https://www.jianshu.com/p/a86e9b112191

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原文地址：https://www.cnblogs.com/open-coder/p/12703704.html