When trying to generate metadata, fatal error: 'clang/AST/DeclBase.h' file not found about ios HOT 2 CLOSED

# in the root of the repo
$ ./download_llvm.sh

# in the metadata-generator folder (to clear any cached objects, run `rm -rf build` first)
$ METADATA_ARCH="arm64" && cmake -DCMAKE_PREFIX_PATH=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr -B build -DCMAKE_BUILD_TYPE=Release -DMETADATA_BINARY_ARCH=$METADATA_ARCH -DCMAKE_OSX_ARCHITECTURES=$METADATA_ARCH && cmake --build build 
-- The C compiler identification is AppleClang 13.1.6.13160021
-- The CXX compiler identification is AppleClang 13.1.6.13160021
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found LibXml2: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/libxml2.tbd (found version "2.9.4") 
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/jamie/Documents/git/ns-v8ios-runtime/metadata-generator/build
[  3%] Building CXX object src/CMakeFiles/objc-metadata-generator.dir/Binary/binaryHashtable.cpp.o
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[ 26%] Building CXX object src/CMakeFiles/objc-metadata-generator.dir/Binary/metaFile.cpp.o
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[ 34%] Building CXX object src/CMakeFiles/objc-metadata-generator.dir/main.cpp.o
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[ 84%] Building CXX object src/CMakeFiles/objc-metadata-generator.dir/TypeScript/DefinitionWriter.cpp.o
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[100%] Linking CXX executable ../bin/objc-metadata-generator
[100%] Built target objc-metadata-generator