/usr/ is in libccss-dev 0.5.0-4build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/ccss-1/
/usr/include/ccss-1/ccss/
/usr/include/ccss-1/ccss/ccss-background.h
/usr/include/ccss-1/ccss/ccss-block.h
/usr/include/ccss-1/ccss/ccss-border-image.h
/usr/include/ccss-1/ccss/ccss-border.h
/usr/include/ccss-1/ccss/ccss-color-parser.h
/usr/include/ccss-1/ccss/ccss-color.h
/usr/include/ccss-1/ccss/ccss-function.h
/usr/include/ccss-1/ccss/ccss-grammar.h
/usr/include/ccss-1/ccss/ccss-macros.h
/usr/include/ccss-1/ccss/ccss-node.h
/usr/include/ccss-1/ccss/ccss-padding.h
/usr/include/ccss-1/ccss/ccss-position.h
/usr/include/ccss-1/ccss/ccss-property.h
/usr/include/ccss-1/ccss/ccss-style.h
/usr/include/ccss-1/ccss/ccss-stylesheet.h
/usr/include/ccss-1/ccss/ccss.h
/usr/include/ccss-1/ccss-cairo/
/usr/include/ccss-1/ccss-cairo/ccss-cairo-grammar.h
/usr/include/ccss-1/ccss-cairo/ccss-cairo-style.h
/usr/include/ccss-1/ccss-cairo/ccss-cairo.h
/usr/include/ccss-1/ccss-gtk/
/usr/include/ccss-1/ccss-gtk/ccss-gtk-grammar.h
/usr/include/ccss-1/ccss-gtk/ccss-gtk-stylesheet.h
/usr/include/ccss-1/ccss-gtk/ccss-gtk.h
/usr/lib/
/usr/lib/pkgconfig/
/usr/lib/pkgconfig/ccss-1.pc
/usr/lib/pkgconfig/ccss-cairo-1.pc
/usr/lib/pkgconfig/ccss-gtk-1.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libccss-dev/
/usr/share/doc/libccss-dev/copyright
/usr/lib/libccss-1.so
/usr/lib/libccss-cairo-1.so
/usr/lib/libccss-gtk-1.so
/usr/share/doc/libccss-dev/AUTHORS
/usr/share/doc/libccss-dev/NEWS.gz
/usr/share/doc/libccss-dev/README
/usr/share/doc/libccss-dev/TODO
/usr/share/doc/libccss-dev/changelog.Debian.gz