[www-scripts] Sphinx Doc Update: ERROR

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UPDATING lld SOURCES
Updating '.':
D    ELF/Bits.h
U    ELF/Target.h
U    ELF/Config.h
U    ELF/Relocations.cpp
U    ELF/SyntheticSections.cpp
U    ELF/Arch/X86_64.cpp
U    ELF/Arch/X86.cpp
U    ELF/Arch/PPC64.cpp
U    wasm/MarkLive.cpp
U    wasm/Config.h
U    wasm/InputChunks.cpp
U    wasm/Writer.cpp
U    wasm/SymbolTable.cpp
U    wasm/Options.td
U    wasm/Writer.h
U    wasm/SymbolTable.h
U    wasm/InputFiles.cpp
U    wasm/Symbols.cpp
U    wasm/Driver.cpp
U    wasm/Symbols.h
U    wasm/LTO.cpp
U    COFF/PDB.cpp
U    COFF/Writer.cpp
U    test/COFF/pdb-relative-source-lines.test
U    test/MinGW/driver.test
U    test/ELF/tls-dynamic.s
A    test/ELF/x86-64-static-tls-model.s
U    test/ELF/ppc64-gd-to-ie.s
U    test/ELF/tls-opt-iele-i686-nopic.s
U    test/ELF/trace.s
U    test/ELF/i386-tls-ie-shared.s
A    test/ELF/x86-64-pcrel.s
U    test/ELF/ppc64-tls-ld-le.s
U    test/ELF/ppc64-tls-gd-le.s
A    test/ELF/i386-static-tls-model.s
A    test/ELF/Inputs/i386-static-tls-model4.s
A    test/ELF/Inputs/i386-static-tls-model1.s
A    test/ELF/Inputs/i386-static-tls-model2.s
A    test/ELF/Inputs/i386-static-tls-model3.s
U    test/ELF/tls-dynamic-i686.s
A    test/ELF/arm-thunk-multipass-plt.s
U    test/ELF/linkerscript/segment-none.s
U    test/ELF/tls-initial-exec-local.s
U    test/ELF/tls-got.s
U    test/wasm/lto/weak.ll
U    test/wasm/lto/opt-level.ll
A    test/wasm/trace.test
U    test/wasm/Inputs/undefined-globals.yaml
U    test/wasm/Inputs/globals.yaml
U    test/wasm/reloc-addend.ll
U    test/wasm/locals-duplicate.test
A    test/wasm/trace-symbol.ll
U    test/wasm/relocatable.ll
U    test/wasm/stack-pointer.ll
U    MinGW/Options.td
U    test/wasm/many-functions.ll
U    test/wasm/weak-alias.ll
U    test/wasm/data-layout.ll
U    docs/missingkeyfunction.rst
U    test/wasm/fatal-warnings.ll
U    test/wasm/export.ll
U    MinGW/Driver.cpp
U    docs/index.rst
Updated to revision 353399.
-- Could NOT find Z3 (missing:  Z3_LIBRARIES Z3_INCLUDE_DIR) (Required is at least version "4.7.1")
CMake Error at cmake/modules/CheckCompilerVersion.cmake:40 (message):
  Host GCC version should be at least 5.1 because LLVM will soon use new C++
  features which your toolchain version doesn't support.  Your version is
  4.8.4.  You can temporarily opt out using
  LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN, but very soon your toolchain won't be
  supported.
Call Stack (most recent call first):
  cmake/modules/CheckCompilerVersion.cmake:45 (check_compiler_version)
  cmake/config-ix.cmake:13 (include)
  CMakeLists.txt:655 (include)


-- Configuring incomplete, errors occurred!
See also "/opt/sphinx-docs/build/llvm/CMakeFiles/CMakeOutput.log".
See also "/opt/sphinx-docs/build/llvm/CMakeFiles/CMakeError.log".
make[1]: *** [cmake_check_build_system] Error 1
make: *** [tools/lld/docs/CMakeFiles/docs-lld-html.dir/rule] Error 2