/usr/include/xqilla/fulltext/ is in libxqilla-dev 2.3.3-2+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/xqilla/fulltext/AllMatches.hpp
/usr/include/xqilla/fulltext/DefaultTokenStore.hpp
/usr/include/xqilla/fulltext/DefaultTokenizer.hpp
/usr/include/xqilla/fulltext/FTAnd.hpp
/usr/include/xqilla/fulltext/FTContains.hpp
/usr/include/xqilla/fulltext/FTContent.hpp
/usr/include/xqilla/fulltext/FTDistance.hpp
/usr/include/xqilla/fulltext/FTMildnot.hpp
/usr/include/xqilla/fulltext/FTOption.hpp
/usr/include/xqilla/fulltext/FTOr.hpp
/usr/include/xqilla/fulltext/FTOrder.hpp
/usr/include/xqilla/fulltext/FTRange.hpp
/usr/include/xqilla/fulltext/FTScope.hpp
/usr/include/xqilla/fulltext/FTSelection.hpp
/usr/include/xqilla/fulltext/FTUnaryNot.hpp
/usr/include/xqilla/fulltext/FTWindow.hpp
/usr/include/xqilla/fulltext/FTWords.hpp
/usr/include/xqilla/fulltext/Match.hpp
/usr/include/xqilla/fulltext/TokenInfo.hpp
/usr/include/xqilla/fulltext/TokenStore.hpp
/usr/include/xqilla/fulltext/Tokenizer.hpp