Can’t build swift 5.1.4 toolchain

OS: macosx 10.14.6

git clone -b swift-5.1.4-RELEASE

swift/utils/update-check --clone --tag swift-5.1.4-RELEASE

swift/utils/build-toolchain com.xtian.swift


-- /Applications/
-- /Applications/
-- /Applications/
-- /Applications/
CMake Warning at docs/CMakeLists.txt:24 (message):
Unable to find sphinx-build program. Not building docs

-- Configuring done
CMake Error in cmake/modules/CMakeLists.txt:
export called with target "swiftSwiftLang-macosx-x86_64" which requires
target "sourcekitd" that is not in any export set.

-- Generating done
CMake Warning:

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