ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/851] ACTION //libcxx/include:write_config_site(//llvm/utils/gn/build/toolchain:unix)
FAILED: include/c++/v1/__config_site 
python3 ../../llvm/utils/gn/build/write_cmake_config.py -o include/c++/v1/__config_site ../../libcxx/include/__config_site.in _LIBCPP_ABI_FORCE_ITANIUM= _LIBCPP_ABI_FORCE_MICROSOFT= _LIBCPP_EXTRA_SITE_DEFINES= _LIBCPP_HAS_NO_FILESYSTEM= _LIBCPP_HAS_NO_THREADS= _LIBCPP_HAS_NO_MONOTONIC_CLOCK= _LIBCPP_HAS_MUSL_LIBC= _LIBCPP_HAS_THREAD_API_PTHREAD= _LIBCPP_HAS_THREAD_API_EXTERNAL= _LIBCPP_HAS_THREAD_API_WIN32= _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS= _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS=1 _LIBCPP_NO_VCRUNTIME= _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION= _LIBCPP_HAS_NO_RANDOM_DEVICE= _LIBCPP_HAS_NO_LOCALIZATION= _LIBCPP_HAS_NO_UNICODE= _LIBCPP_HAS_NO_WIDE_CHARACTERS= _LIBCPP_HAS_NO_STD_MODULES= _LIBCPP_HAS_NO_TERMINAL= _LIBCPP_INSTRUMENTED_WITH_ASAN= _LIBCPP_ABI_DEFINES= _LIBCPP_HARDENING_MODE_DEFAULT=_LIBCPP_HARDENING_MODE_NONE _LIBCPP_PSTL_BACKEND_LIBDISPATCH= _LIBCPP_PSTL_BACKEND_SERIAL=1 _LIBCPP_PSTL_BACKEND_STD_THREAD= _LIBCPP_ABI_VERSION= _LIBCPP_ABI_NAMESPACE=__1 _LIBCPP_HAS_NO_TIME_ZONE_DATABASE=1
Traceback (most recent call last):
  File "/Users/thakis/src/llvm-project/out/gn/../../llvm/utils/gn/build/write_cmake_config.py", line 122, in <module>
    sys.exit(main())
  File "/Users/thakis/src/llvm-project/out/gn/../../llvm/utils/gn/build/write_cmake_config.py", line 75, in main
    if values[var] == "0":
KeyError: '_LIBCPP_HAS_THREADS'
[2/851] CXX obj/lld/Common/Common.TargetOptionsCommandFlags.o
[3/851] CXX obj/lld/Common/Common.Memory.o
[4/851] CXX obj/lld/Common/Common.Timer.o
[5/851] CXX obj/lld/Common/Common.Reproduce.o
[6/851] CXX obj/lld/Common/Common.Filesystem.o
[7/851] CXX obj/lld/Common/Common.Strings.o
[8/851] CXX obj/lld/COFF/COFF.Symbols.o
[9/851] CXX obj/lld/COFF/COFF.SymbolTable.o
[10/851] CXX obj/lld/COFF/COFF.Writer.o
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.