升级到Mojave后，我的rubymotion（6.1）应用程序无法编译。我收到以下错误：
Class _TtCs18__stdlib_AtomicInt is implemented in both /usr/lib/swift/libswiftCore.dylib (0x7fffa61010c8) and /Applications/Xcode.app/Contents/Frameworks/libswiftCore.dylib (0x1072be158).
One of the two will be used. Which one is undefined.
Class _TtCs19__EmptyArrayStorage is implemented in both /usr/lib/swift/libswiftCore.dylib (0x7fffa60f31e0) and /Applications/Xcode.app/Contents/Frameworks/libswiftCore.dylib (0x1072b0268).
One of the two will be used. Which one is undefined.
...
"This copy of libswiftCore.dylib requires an OS version prior to 10.14.4"
这是由Rubymotion人修复的。使用更新的Rubymotion再次运行它我收到一条错误消息，说明该怎么做。
我不得不跑：
sudo cp -r /usr/lib/swift/*.dylib /Applications/Xcode.app/Contents/Frameworks
sudo touch /Applications/Xcode.app/Contents/Frameworks/.swift-5-staged