Xcode 6.0でswift/swiftcを起動する Never run this procedure on Mountain Lion or former, or you will have unexpected behavior. Mountain Lion以下では絶対に実行しないでください。 In short, you can just copy everything. cd /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/ sudo mkdir MacOSX10.10.sdk cd MacOSX10.10.sdk sudo cp ../MacOSX10.9.sdk/SDKSettings.plist ./ sudo sed -i -e 's/10\.9/10.1