swift-stdlib-macosx-x86_64 build fail log

buildlog.sh

Building the standard library for: swift-stdlib-macosx-x86_64

cmark: using standard linker
++ cmake_config_opt cmark
++ product=cmark
++ [[ Ninja == \X\c\o\d\e ]]
+ /usr/local/bin/cmake --build /Users/johnlinvc/Projs/swift-core-2/build/Ninja-DebugAssert/cmark-macosx-x86_64 -- -j8 all
ninja: no work to do.
llvm: using standard linker
++ cmake_config_opt llvm
++ product=llvm
++ [[ Ninja == \X\c\o\d\e ]]
+ /usr/local/bin/cmake --build /Users/johnlinvc/Projs/swift-core-2/build/Ninja-DebugAssert/llvm-macosx-x86_64 -- -j8 all
[2/2] Running utility command for scan-build
swift: using standard linker
++ cmake_config_opt swift
++ product=swift
++ [[ Ninja == \X\c\o\d\e ]]
+ /usr/local/bin/cmake --build /Users/johnlinvc/Projs/swift-core-2/build/Ninja-DebugAssert/swift-macosx-x86_64 -- -j8 all swift-stdlib-macosx-x86_64
[7/125] Building HTML documentation
FAILED: cd /Users/johnlinvc/Projs/swift-core-2/swift/docs && /usr/local/bin/sphinx-build -W -D latex_paper_size=letter -d /Users/johnlinvc/Projs/swift-core-2/build/Ninja-DebugAssert/swift-macosx-x86_64/doctrees -b html . /Users/johnlinvc/Projs/swift-core-2/build/Ninja-DebugAssert/swift-macosx-x86_64/docs/html
Traceback (most recent call last):
  File "/usr/local/bin/sphinx-build", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/site-packages/sphinx/__init__.py", line 51, in main
    sys.exit(build_main(argv))
  File "/usr/local/lib/python2.7/site-packages/sphinx/__init__.py", line 61, in build_main
    from sphinx import cmdline
  File "/usr/local/lib/python2.7/site-packages/sphinx/cmdline.py", line 19, in <module>
    from docutils.utils import SystemMessage
  File "/usr/local/lib/python2.7/site-packages/docutils/utils/__init__.py", line 20, in <module>
    import docutils.io
  File "/usr/local/lib/python2.7/site-packages/docutils/io.py", line 18, in <module>
    from docutils.utils.error_reporting import locale_encoding, ErrorString, ErrorOutput
  File "/usr/local/lib/python2.7/site-packages/docutils/utils/error_reporting.py", line 47, in <module>
    locale_encoding = locale.getlocale()[1] or locale.getdefaultlocale()[1]
  File "/usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/locale.py", line 543, in getdefaultlocale
    return _parse_localename(localename)
  File "/usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/locale.py", line 475, in _parse_localename
    raise ValueError, 'unknown locale: %s' % localename
ValueError: unknown locale: UTF-8
[7/125] Building CXX object tools/SourceKit/tools/sourcekitd/bin/XPC/Client/CMakeFiles/sourcekitd.dir/tracer.cpp.o