/usr/include/ is in libgegl-dev 0.2.0-4ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gegl-0.2/
/usr/include/gegl-0.2/gegl-curve.h
/usr/include/gegl-0.2/gegl-plugin.h
/usr/include/gegl-0.2/gegl-lookup.h
/usr/include/gegl-0.2/gegl-chant.h
/usr/include/gegl-0.2/gegl.h
/usr/include/gegl-0.2/gegl-utils.h
/usr/include/gegl-0.2/gegl-tile-source.h
/usr/include/gegl-0.2/gegl-types.h
/usr/include/gegl-0.2/opencl/
/usr/include/gegl-0.2/opencl/gegl-cl.h
/usr/include/gegl-0.2/opencl/cl_ext.h
/usr/include/gegl-0.2/opencl/cl.h
/usr/include/gegl-0.2/opencl/cl_gl_ext.h
/usr/include/gegl-0.2/opencl/cl_d3d10.h
/usr/include/gegl-0.2/opencl/cl_platform.h
/usr/include/gegl-0.2/opencl/cl_gl.h
/usr/include/gegl-0.2/opencl/gegl-cl-types.h
/usr/include/gegl-0.2/opencl/gegl-cl-color.h
/usr/include/gegl-0.2/opencl/opencl.h
/usr/include/gegl-0.2/opencl/gegl-cl-init.h
/usr/include/gegl-0.2/gegl-buffer.h
/usr/include/gegl-0.2/operation/
/usr/include/gegl-0.2/operation/gegl-operation.h
/usr/include/gegl-0.2/operation/gegl-operation-filter.h
/usr/include/gegl-0.2/operation/gegl-operation-meta.h
/usr/include/gegl-0.2/operation/gegl-operation-point-filter.h
/usr/include/gegl-0.2/operation/gegl-operation-composer.h
/usr/include/gegl-0.2/operation/gegl-operation-sink.h
/usr/include/gegl-0.2/operation/gegl-operation-point-composer.h
/usr/include/gegl-0.2/operation/gegl-operation-temporal.h
/usr/include/gegl-0.2/operation/gegl-operation-composer3.h
/usr/include/gegl-0.2/operation/gegl-operation-source.h
/usr/include/gegl-0.2/operation/gegl-operation-point-render.h
/usr/include/gegl-0.2/operation/gegl-operation-point-composer3.h
/usr/include/gegl-0.2/operation/gegl-operation-area-filter.h
/usr/include/gegl-0.2/gegl-tile-backend.h
/usr/include/gegl-0.2/gegl-enums.h
/usr/include/gegl-0.2/gegl-matrix.h
/usr/include/gegl-0.2/gegl-paramspecs.h
/usr/include/gegl-0.2/gegl-path.h
/usr/include/gegl-0.2/gegl-version.h
/usr/include/gegl-0.2/gegl-buffer-iterator.h
/usr/include/gegl-0.2/gegl-color.h
/usr/include/gegl-0.2/gegl-tile.h
/usr/include/gegl-0.2/gegl-buffer-backend.h