Windows Build Error from MozillaBuild 1.11.0.

gistfile1.txt

 0:07.50 From dist/sdk: Kept 0 existing; Added/updated 0; Removed 8 files and 2 directories.
 0:07.63 From dist/xpi-stage: Kept 1 existing; Added/updated 0; Removed 1 files and 0 directories.
 0:18.78 From _tests: Kept 35028 existing; Added/updated 5; Removed 0 files and 0 directories.
 0:20.47 From ../../dist/idl: Kept 1127 existing; Added/updated 0; Removed 0 files and 0 directories.
 0:21.09 Traceback (most recent call last):
 0:21.09   File "c:\mozilla-build\python\Lib\runpy.py", line 162, in _run_module_as_main
 0:21.09     "__main__", fname, loader, pkg_name)
 0:21.09   File "c:\mozilla-build\python\Lib\runpy.py", line 72, in _run_code
 0:21.11     exec code in run_globals
 0:21.12   File "c:\mozilla-build\msys\P\mozilla-central\python\mozbuild\mozbuild\action\cl.py", line 122, in <module>
 0:21.14     sys.exit(main(sys.argv[1:]))
 0:21.14   File "c:\mozilla-build\msys\P\mozilla-central\python\mozbuild\mozbuild\action\cl.py", line 119, in main
 0:21.15     return InvokeClWithDependencyGeneration(args)
 0:21.15   File "c:\mozilla-build\msys\P\mozilla-central\python\mozbuild\mozbuild\action\cl.py", line 94, in InvokeClWithDependencyGeneration
 0:21.20     p.run()
 0:21.20   File "c:\mozilla-build\msys\P\mozilla-central\testing\mozbase\mozprocess\mozprocess\processhandler.py", line 700, in run
 0:21.25     self.proc = self.Process([self.cmd] + self.args, **args)
 0:21.28   File "c:\mozilla-build\msys\P\mozilla-central\testing\mozbase\mozprocess\mozprocess\processhandler.py", line 103, in __init__
 0:21.32     universal_newlines, startupinfo, creationflags)
 0:21.34   File "c:\mozilla-build\python\Lib\subprocess.py", line 710, in __init__
 0:21.34     errread, errwrite)
 0:21.34   File "c:\mozilla-build\msys\P\mozilla-central\testing\mozbase\mozprocess\mozprocess\processhandler.py", line 185, in _execute_child
 0:21.48     errread, errwrite) = args_tuple
 0:21.50 ValueError: too many values to unpack
 0:21.50 c:/mozilla-build/msys/P/objdir-mozilla-central/_virtualenv/Scripts/python.exe -m mozbuild.action.cl cl -P -Fiself-hosting-preprocessed.pp -DNS_WARN_UNUSED_RESULT= -DHAVE__GETC_NOLOCK=1 -DAB_CD= -DCPP_THROW_NEW=throw() -D_WIN32_WINNT=0x502 -DNO_X11=1 -DHAVE_SNPRINTF=1 -DU_USING_ICU_NAMESPACE=0 -DMOZILLA_UAVERSION="39.0" -DNO_NSPR_10_SUPPORT=1 -DEXPOSE_INTL_API=1 -DXP_WIN32=1 -DDLL_SUFFIX=".dll" -DMOZ_DLL_SUFFIX=".dll" -DDLL_PREFIX="" -D_CRT_RAND_S=1 -DMOZ_NTDDI_WIN7=0x06010000 -DHAVE_FORCEINLINE=1 -DJS_CPU_X86=1 -DHAVE_HYPOT=1 -DFFI_BUILDING=1 -DMOZILLA_VERSION="39.0a1" -DNS_ATTR_MALLOC= -DJS_CODEGEN_X86=1 -DNIGHTLY_BUILD=1 -DSTATIC_JS_API=1 -DJS_HAS_CTYPES=1 -DENABLE_INTL_API=1 -DMALLOC_H=<malloc.h> -DSTDC_HEADERS=1 -DMOZ_MEMORY_WINDOWS=1 -DWIN32_LEAN_AND_MEAN=1 -DMOZ_WINSDK_TARGETVER=0x06030000 -DENABLE_BINARYDATA=1 -DEXPORT_JS_API=1 -DNDEBUG=1 -D_CRT_NONSTDC_NO_WARNINGS=1 -DMOZJS_MINOR_VERSION=0 -DWIN32=1 -DTRIMMED=1 -D_X86_=1 -DJS_NUNBOX32=1 -DJS_TRACE_LOGGING=1 -DHAVE_LOCALECONV=1 -DHW_THREADS=1 -D_WIN32_IE=0x0603 -DD_INO=d_ino -DWINVER=0x502 -DMOZILLA_VERSION_U=39.0a1 -D_CRT_SECURE_NO_WARNINGS=1 -DJS_DEFAULT_JITREPORT_GRANULARITY=3 -DU_STATIC_IMPLEMENTATION=1 -DMOZ_DEBUG_SYMBOLS=1 -DMOZ_UPDATE_CHANNEL=default -DMOZJS_MAJOR_VERSION=39 -DENABLE_SHARED_ARRAY_BUFFER=1 -DXP_WIN=1 -DMOZ_MEMORY=1 -DX_DISPLAY_MISSING=1 -DHAVE__MSIZE=1 -D_WINDOWS=1 self-hosting-cpp-input.cpp
 0:23.09 Makefile:348: recipe for target 'selfhosted.out.h' failed
 0:23.09 mozmake.EXE[5]: *** [selfhosted.out.h] Error 1
 0:23.10 c:/mozilla-build/msys/P/mozilla-central/config/recurse.mk:82: recipe for target 'js/src/export' failed
 0:23.12 mozmake.EXE[4]: *** [js/src/export] Error 2
 0:23.12 mozmake.EXE[4]: *** Waiting for unfinished jobs....
 0:23.12 cd include; c:/mozilla-build/mozmake/mozmake.EXE private_export