/usr/include/clang/Basic/ is in libclang-dev 3.0-6ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/clang/Basic/ABI.h
/usr/include/clang/Basic/AddressSpaces.h
/usr/include/clang/Basic/AttrKinds.h
/usr/include/clang/Basic/AttrList.inc
/usr/include/clang/Basic/Builtins.def
/usr/include/clang/Basic/Builtins.h
/usr/include/clang/Basic/BuiltinsARM.def
/usr/include/clang/Basic/BuiltinsPPC.def
/usr/include/clang/Basic/BuiltinsPTX.def
/usr/include/clang/Basic/BuiltinsX86.def
/usr/include/clang/Basic/ConvertUTF.h
/usr/include/clang/Basic/DelayedCleanupPool.h
/usr/include/clang/Basic/Diagnostic.h
/usr/include/clang/Basic/DiagnosticASTKinds.inc
/usr/include/clang/Basic/DiagnosticAnalysisKinds.inc
/usr/include/clang/Basic/DiagnosticCategories.h
/usr/include/clang/Basic/DiagnosticCommonKinds.inc
/usr/include/clang/Basic/DiagnosticDriverKinds.inc
/usr/include/clang/Basic/DiagnosticFrontendKinds.inc
/usr/include/clang/Basic/DiagnosticGroups.inc
/usr/include/clang/Basic/DiagnosticIDs.h
/usr/include/clang/Basic/DiagnosticIndexName.inc
/usr/include/clang/Basic/DiagnosticLexKinds.inc
/usr/include/clang/Basic/DiagnosticParseKinds.inc
/usr/include/clang/Basic/DiagnosticSemaKinds.inc
/usr/include/clang/Basic/ExceptionSpecificationType.h
/usr/include/clang/Basic/ExpressionTraits.h
/usr/include/clang/Basic/FileManager.h
/usr/include/clang/Basic/FileSystemOptions.h
/usr/include/clang/Basic/FileSystemStatCache.h
/usr/include/clang/Basic/IdentifierTable.h
/usr/include/clang/Basic/LLVM.h
/usr/include/clang/Basic/LangOptions.def
/usr/include/clang/Basic/LangOptions.h
/usr/include/clang/Basic/Linkage.h
/usr/include/clang/Basic/MacroBuilder.h
/usr/include/clang/Basic/OnDiskHashTable.h
/usr/include/clang/Basic/OpenCL.h
/usr/include/clang/Basic/OpenCLExtensions.def
/usr/include/clang/Basic/OperatorKinds.def
/usr/include/clang/Basic/OperatorKinds.h
/usr/include/clang/Basic/PartialDiagnostic.h
/usr/include/clang/Basic/PrettyStackTrace.h
/usr/include/clang/Basic/SourceLocation.h
/usr/include/clang/Basic/SourceManager.h
/usr/include/clang/Basic/SourceManagerInternals.h
/usr/include/clang/Basic/Specifiers.h
/usr/include/clang/Basic/TargetBuiltins.h
/usr/include/clang/Basic/TargetInfo.h
/usr/include/clang/Basic/TargetOptions.h
/usr/include/clang/Basic/TemplateKinds.h
/usr/include/clang/Basic/TokenKinds.def
/usr/include/clang/Basic/TokenKinds.h
/usr/include/clang/Basic/TypeTraits.h
/usr/include/clang/Basic/Version.h
/usr/include/clang/Basic/Version.inc
/usr/include/clang/Basic/VersionTuple.h
/usr/include/clang/Basic/Visibility.h
/usr/include/clang/Basic/arm_neon.inc