/usr/include/spice-1/spice/ is in libspice-protocol-dev 0.12.12-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/spice-1/spice/barrier.h
/usr/include/spice-1/spice/controller_prot.h
/usr/include/spice-1/spice/end-packed.h
/usr/include/spice-1/spice/enums.h
/usr/include/spice-1/spice/error_codes.h
/usr/include/spice-1/spice/foreign_menu_prot.h
/usr/include/spice-1/spice/ipc_ring.h
/usr/include/spice-1/spice/macros.h
/usr/include/spice-1/spice/protocol.h
/usr/include/spice-1/spice/qxl_dev.h
/usr/include/spice-1/spice/qxl_windows.h
/usr/include/spice-1/spice/start-packed.h
/usr/include/spice-1/spice/stats.h
/usr/include/spice-1/spice/types.h
/usr/include/spice-1/spice/vd_agent.h
/usr/include/spice-1/spice/vdi_dev.h