/usr/include/ is in libzltext-dev 0.12.10dfsg-9.1+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/zlibrary/
/usr/include/zlibrary/text/
/usr/include/zlibrary/text/ZLTextStyleCollection.h
/usr/include/zlibrary/text/ZLTextHyphenator.h
/usr/include/zlibrary/text/ZLTextSelectionModel.h
/usr/include/zlibrary/text/ZLTextPositionIndicator.h
/usr/include/zlibrary/text/ZLTextFontModifier.h
/usr/include/zlibrary/text/ZLTextPositionIndicatorInfo.h
/usr/include/zlibrary/text/ZLTextTeXHyphenator.h
/usr/include/zlibrary/text/ZLTextStyle.h
/usr/include/zlibrary/text/ZLTextRectangle.h
/usr/include/zlibrary/text/ZLTextParagraphCursor.h
/usr/include/zlibrary/text/ZLTextParagraph.h
/usr/include/zlibrary/text/ZLTextStyleOptions.h
/usr/include/zlibrary/text/ZLTextWord.h
/usr/include/zlibrary/text/ZLTextRowMemoryAllocator.h
/usr/include/zlibrary/text/ZLTextAlignmentType.h
/usr/include/zlibrary/text/ZLTextView.h
/usr/include/zlibrary/text/ZLTextKind.h
/usr/include/zlibrary/text/ZLTextElement.h
/usr/include/zlibrary/text/ZLTextArea.h
/usr/include/zlibrary/text/ZLTextModel.h
/usr/include/zlibrary/text/ZLTextMark.h
/usr/include/zlibrary/text/ZLTextAreaController.h