我正在尝试从源（https://github.com/apple/swift）构建Swift。但是，在构建pasasecriptexecution时，它会引发错误。这是错误消息：
<unknown>:0: error: Swift does not support the SDK 'MacOSX10.11.sdk'
make: *** [/Users/yangwei/Git/build/Xcode-DebugAssert/swift-macosx-x86_64/stdlib/public/core/macosx/x86_64/Swift.o] Error 1
** BUILD FAILED **
The following build commands failed:
PhaseScriptExecution CMake Rules /Users/yangwei/Git/build/Xcode-DebugAssert/swift-macosx-x86_64/stdlib/public/core/Swift.build/Debug/add_custom_command_target-8e6e230f23a92c1cda79a3cf59140ab8-Swift.o.build/Script-4123DECAA170465EA6F4D9CC.sh
(1 failure)
这似乎是与SDK版本有关的问题。谁能告诉我我应该使用哪个SDK版本？以及如何降级到版本？
谢谢！
更新：
我注意到了版本问题，因此我试图检查Swift-2.2和所有其他必需项目的Swift-2.2的分支。但是，当我尝试使用命令utils/build-script -x构建时，它显示了以下错误消息：
make -f /Users/yangwei/Git/build/Xcode-DebugAssert/llvm-macosx-x86_64/CMakeScripts/ReRunCMake.make
make[1]: *** No rule to make target '/Users/yangwei/Git/llvm/lib/DebugInfo/CodeView/CMakeLists.txt', needed by '/Users/yangwei/Git/build/Xcode-DebugAssert/llvm-macosx-x86_64/CMakeFiles/cmake.check_cache'. Stop.
make: *** [/Users/yangwei/Git/build/Xcode-DebugAssert/llvm-macosx-x86_64/CMakeFiles/ZERO_CHECK] Error 2
Command /bin/sh failed with exit code 2
** BUILD FAILED **
The following build commands failed:
PhaseScriptExecution CMake Rules /Users/yangwei/Git/build/Xcode-DebugAssert/llvm-macosx-x86_64/LLVM.build/Debug/ZERO_CHECK.build/Script-80DAA73EAB654B0EA77D1AEF.sh
(1 failure)
utils/build-script: command terminated with a non-zero exit status 65, aborting
我认为您需要新的Xcode 8 Beta来构建最新的Swift源。
安装后，尝试：
sudo xcode-select -s /Applications/Xcode-beta.app/Contents/Developer/