/usr/include/codeblocks/wxContribItems/wxFlatNotebook/ is in codeblocks-dev 13.12+dfsg-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/codeblocks/wxContribItems/wxFlatNotebook/include/
/usr/include/codeblocks/wxContribItems/wxFlatNotebook/include/wx/
/usr/include/codeblocks/wxContribItems/wxFlatNotebook/include/wx/wxFlatNotebook/
/usr/include/codeblocks/wxContribItems/wxFlatNotebook/include/wx/wxFlatNotebook/fnb_singleton.h
/usr/include/codeblocks/wxContribItems/wxFlatNotebook/include/wx/wxFlatNotebook/fnb_smart_ptr.h
/usr/include/codeblocks/wxContribItems/wxFlatNotebook/include/wx/wxFlatNotebook/renderer.h
/usr/include/codeblocks/wxContribItems/wxFlatNotebook/include/wx/wxFlatNotebook/wxFNBDropTarget.h
/usr/include/codeblocks/wxContribItems/wxFlatNotebook/include/wx/wxFlatNotebook/wxFlatNotebook.h
/usr/include/codeblocks/wxContribItems/wxFlatNotebook/include/wx/wxFlatNotebook/wxFlatNotebookSDK.h