/usr/include/ is in libfm-qt-dev 0.10.0+20151214-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libfm-qt/
/usr/include/libfm-qt/appchoosercombobox.h
/usr/include/libfm-qt/proxyfoldermodel.h
/usr/include/libfm-qt/folderitemdelegate.h
/usr/include/libfm-qt/dndactionmenu.h
/usr/include/libfm-qt/filemenu_p.h
/usr/include/libfm-qt/utilities.h
/usr/include/libfm-qt/foldermodelitem.h
/usr/include/libfm-qt/fm-qt_export.h
/usr/include/libfm-qt/filesearchdialog.h
/usr/include/libfm-qt/mountoperation.h
/usr/include/libfm-qt/libfmqt.h
/usr/include/libfm-qt/createnewmenu.h
/usr/include/libfm-qt/filepropsdialog.h
/usr/include/libfm-qt/fm-search.h
/usr/include/libfm-qt/folderview.h
/usr/include/libfm-qt/utilities_p.h
/usr/include/libfm-qt/sidepane.h
/usr/include/libfm-qt/folderview_p.h
/usr/include/libfm-qt/dnddest.h
/usr/include/libfm-qt/browsehistory.h
/usr/include/libfm-qt/appchooserdialog.h
/usr/include/libfm-qt/dirtreemodelitem.h
/usr/include/libfm-qt/fileoperationdialog.h
/usr/include/libfm-qt/applaunchcontext.h
/usr/include/libfm-qt/appmenuview.h
/usr/include/libfm-qt/dirtreeview.h
/usr/include/libfm-qt/execfiledialog_p.h
/usr/include/libfm-qt/renamedialog.h
/usr/include/libfm-qt/appmenuview_p.h
/usr/include/libfm-qt/placesmodel.h
/usr/include/libfm-qt/pathedit_p.h
/usr/include/libfm-qt/fileoperation.h
/usr/include/libfm-qt/cachedfoldermodel.h
/usr/include/libfm-qt/pathedit.h
/usr/include/libfm-qt/path.h
/usr/include/libfm-qt/placesmodelitem.h
/usr/include/libfm-qt/foldermodel.h
/usr/include/libfm-qt/editbookmarksdialog.h
/usr/include/libfm-qt/placesview.h
/usr/include/libfm-qt/dirtreemodel.h
/usr/include/libfm-qt/libfmqtglobals.h
/usr/include/libfm-qt/filemenu.h
/usr/include/libfm-qt/mountoperationpassworddialog_p.h
/usr/include/libfm-qt/filelauncher.h
/usr/include/libfm-qt/fontbutton.h
/usr/include/libfm-qt/thumbnailloader.h
/usr/include/libfm-qt/mountoperationquestiondialog_p.h
/usr/include/libfm-qt/foldermenu.h
/usr/include/libfm-qt/colorbutton.h
/usr/include/libfm-qt/bookmarkaction.h
/usr/include/libfm-qt/icontheme.h