/usr/include/gegl-0.0/operation/ is in libgegl-0.0-dev 0.0.22-2ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gegl-0.0/operation/gegl-operation-area-filter.h
/usr/include/gegl-0.0/operation/gegl-operation-composer.h
/usr/include/gegl-0.0/operation/gegl-operation-composer3.h
/usr/include/gegl-0.0/operation/gegl-operation-filter.h
/usr/include/gegl-0.0/operation/gegl-operation-meta.h
/usr/include/gegl-0.0/operation/gegl-operation-point-composer.h
/usr/include/gegl-0.0/operation/gegl-operation-point-composer3.h
/usr/include/gegl-0.0/operation/gegl-operation-point-filter.h
/usr/include/gegl-0.0/operation/gegl-operation-point-render.h
/usr/include/gegl-0.0/operation/gegl-operation-sink.h
/usr/include/gegl-0.0/operation/gegl-operation-source.h
/usr/include/gegl-0.0/operation/gegl-operation-temporal.h
/usr/include/gegl-0.0/operation/gegl-operation.h