/usr/lib/ is in liblld-6.0-dev 1:6.0-1ubuntu2.
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..
/usr/lib/llvm-6.0/
/usr/lib/llvm-6.0/include/
/usr/lib/llvm-6.0/include/lld/
/usr/lib/llvm-6.0/include/lld/Common/
/usr/lib/llvm-6.0/include/lld/Common/Args.h
/usr/lib/llvm-6.0/include/lld/Common/Driver.h
/usr/lib/llvm-6.0/include/lld/Common/ErrorHandler.h
/usr/lib/llvm-6.0/include/lld/Common/LLVM.h
/usr/lib/llvm-6.0/include/lld/Common/Memory.h
/usr/lib/llvm-6.0/include/lld/Common/Reproduce.h
/usr/lib/llvm-6.0/include/lld/Common/Strings.h
/usr/lib/llvm-6.0/include/lld/Common/TargetOptionsCommandFlags.h
/usr/lib/llvm-6.0/include/lld/Common/Threads.h
/usr/lib/llvm-6.0/include/lld/Common/Version.h
/usr/lib/llvm-6.0/include/lld/Core/
/usr/lib/llvm-6.0/include/lld/Core/AbsoluteAtom.h
/usr/lib/llvm-6.0/include/lld/Core/ArchiveLibraryFile.h
/usr/lib/llvm-6.0/include/lld/Core/Atom.h
/usr/lib/llvm-6.0/include/lld/Core/DefinedAtom.h
/usr/lib/llvm-6.0/include/lld/Core/Error.h
/usr/lib/llvm-6.0/include/lld/Core/File.h
/usr/lib/llvm-6.0/include/lld/Core/Instrumentation.h
/usr/lib/llvm-6.0/include/lld/Core/LinkingContext.h
/usr/lib/llvm-6.0/include/lld/Core/Node.h
/usr/lib/llvm-6.0/include/lld/Core/Pass.h
/usr/lib/llvm-6.0/include/lld/Core/PassManager.h
/usr/lib/llvm-6.0/include/lld/Core/Reader.h
/usr/lib/llvm-6.0/include/lld/Core/Reference.h
/usr/lib/llvm-6.0/include/lld/Core/Resolver.h
/usr/lib/llvm-6.0/include/lld/Core/SharedLibraryAtom.h
/usr/lib/llvm-6.0/include/lld/Core/SharedLibraryFile.h
/usr/lib/llvm-6.0/include/lld/Core/Simple.h
/usr/lib/llvm-6.0/include/lld/Core/SymbolTable.h
/usr/lib/llvm-6.0/include/lld/Core/UndefinedAtom.h
/usr/lib/llvm-6.0/include/lld/Core/Writer.h
/usr/lib/llvm-6.0/include/lld/ReaderWriter/
/usr/lib/llvm-6.0/include/lld/ReaderWriter/MachOLinkingContext.h
/usr/lib/llvm-6.0/include/lld/ReaderWriter/YamlContext.h