/usr/include/KF5/KSyntaxHighlighting/ is in libkf5syntaxhighlighting-dev 5.44.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KSyntaxHighlighting/AbstractHighlighter
/usr/include/KF5/KSyntaxHighlighting/Definition
/usr/include/KF5/KSyntaxHighlighting/FoldingRegion
/usr/include/KF5/KSyntaxHighlighting/Format
/usr/include/KF5/KSyntaxHighlighting/Repository
/usr/include/KF5/KSyntaxHighlighting/State
/usr/include/KF5/KSyntaxHighlighting/SyntaxHighlighter
/usr/include/KF5/KSyntaxHighlighting/Theme
/usr/include/KF5/KSyntaxHighlighting/abstracthighlighter.h
/usr/include/KF5/KSyntaxHighlighting/definition.h
/usr/include/KF5/KSyntaxHighlighting/foldingregion.h
/usr/include/KF5/KSyntaxHighlighting/format.h
/usr/include/KF5/KSyntaxHighlighting/ksyntaxhighlighting_export.h
/usr/include/KF5/KSyntaxHighlighting/repository.h
/usr/include/KF5/KSyntaxHighlighting/state.h
/usr/include/KF5/KSyntaxHighlighting/syntaxhighlighter.h
/usr/include/KF5/KSyntaxHighlighting/theme.h