在Matlab R2017b中遇到以下错误：
Error using mex
dyld: Symbol not found: _OBJC_IVAR_$_NSFont._fFlags
Referenced from: /Applications/Xcode.9.4.1.app/Contents/SharedFrameworks/DVTDocumentation.framework/Versions/A/../../../../SharedFrameworks/DVTKit.framework/Versions/A/DVTKit
Expected in: /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
in /Applications/Xcode.9.4.1.app/Contents/SharedFrameworks/DVTDocumentation.framework/Versions/A/../../../../SharedFrameworks/DVTKit.framework/Versions/A/DVTKit
xcrun: error: unable to locate xcodebuild, please make sure the path to the Xcode folder is set correctly!
xcrun: error: You can set the path to the Xcode folder using /usr/bin/xcode-select -switch
我已经下载了应该与Matlab R2017.b兼容的旧版Xcode 9.4，并设置了路径：
> xcode-select -p
/Applications/Xcode.9.4.1.app/Contents/Developer
任何建议都是伟大的！