Xcode12:
modify md-install，comment the download cmd, then change this line
macosxSDKSpecificationsPath=$macosSdkPlatformPath/Developer/Library/Xcode/PrivatePlugIns/IDEOSXSupportCore.ideplugin/Contents/Resources

ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Xcode/PrivatePlugIns/IDEOSXSupportCore.ideplugin/Contents/Resources /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Xcode/Specifications

@sunyuping 前面加上sudo

sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Xcode/PrivatePlugIns/IDEOSXSupportCore.ideplugin/Contents/Resources /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Xcode/Specifications

xcode 14没有这个目录，而且ln -s 也无法解决问题，报错还是显示：
Creating symlink to Xcode templates...
Modifying Bash personal initialization file...
File /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Xcode/Specifications/MacOSX Package Types.xcspec not found

xcode 14解决方式：
下载两个文体： MacOSX Package Types.xcspec MacOSX Product Types.xcspec
https://github.com/qbs/qbs/tree/master/share/qbs/modules/bundle
然后放在路径就好了。/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Xcode/PrivatePlugIns/IDEOSXSupportCore.ideplugin/Contents/Resources