/usr/ is in libspice-client-gtk-3.0-dev 0.33-3.3+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/spice-client-gtk-3.0/
/usr/include/spice-client-gtk-3.0/spice-client-gtk.h
/usr/include/spice-client-gtk-3.0/spice-grabsequence.h
/usr/include/spice-client-gtk-3.0/spice-gtk-session.h
/usr/include/spice-client-gtk-3.0/spice-widget-enums.h
/usr/include/spice-client-gtk-3.0/spice-widget.h
/usr/include/spice-client-gtk-3.0/usb-device-widget.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/spice-client-gtk-3.0.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libspice-client-gtk-3.0-dev/
/usr/share/doc/libspice-client-gtk-3.0-dev/changelog.Debian.gz
/usr/share/doc/libspice-client-gtk-3.0-dev/changelog.gz
/usr/share/doc/libspice-client-gtk-3.0-dev/copyright
/usr/share/gir-1.0/
/usr/share/gir-1.0/SpiceClientGtk-3.0.gir
/usr/share/vala/
/usr/share/vala/vapi/
/usr/share/vala/vapi/spice-client-gtk-3.0.deps
/usr/share/vala/vapi/spice-client-gtk-3.0.vapi
/usr/lib/x86_64-linux-gnu/libspice-client-gtk-3.0.so