/usr/include/ is in libbabl-dev 0.1.10-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/babl-0.1/
/usr/include/babl-0.1/babl/
/usr/include/babl-0.1/babl/babl-sampling.h
/usr/include/babl-0.1/babl/babl-class.h
/usr/include/babl-0.1/babl/babl-mutex.h
/usr/include/babl-0.1/babl/babl-list.h
/usr/include/babl-0.1/babl/babl-classes.h
/usr/include/babl-0.1/babl/babl-ids.h
/usr/include/babl-0.1/babl/babl-macros.h
/usr/include/babl-0.1/babl/babl-format.h
/usr/include/babl-0.1/babl/babl-introspect.h
/usr/include/babl-0.1/babl/babl-version.h
/usr/include/babl-0.1/babl/babl-cpuaccel.h
/usr/include/babl-0.1/babl/babl-types.h
/usr/include/babl-0.1/babl/babl-conversion.h
/usr/include/babl-0.1/babl/babl-model.h
/usr/include/babl-0.1/babl/babl-db.h
/usr/include/babl-0.1/babl/babl-image.h
/usr/include/babl-0.1/babl/babl-util.h
/usr/include/babl-0.1/babl/babl-component.h
/usr/include/babl-0.1/babl/babl.h
/usr/include/babl-0.1/babl/babl-hash-table.h
/usr/include/babl-0.1/babl/babl-type.h
/usr/include/babl-0.1/babl/babl-fish.h
/usr/include/babl-0.1/babl/babl-extension.h
/usr/include/babl-0.1/babl/babl-internal.h
/usr/include/babl-0.1/babl/babl-memory.h