/usr/include/vxl/contrib/gel/vmal/ is in libvxl1-dev 1.17.0.dfsg2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/vxl/contrib/gel/vmal/vmal_convert_osl.h
/usr/include/vxl/contrib/gel/vmal/vmal_convert_vtol.h
/usr/include/vxl/contrib/gel/vmal/vmal_dense_matching.h
/usr/include/vxl/contrib/gel/vmal/vmal_homog2d.h
/usr/include/vxl/contrib/gel/vmal/vmal_lines_correlation.h
/usr/include/vxl/contrib/gel/vmal/vmal_multi_view_data.h
/usr/include/vxl/contrib/gel/vmal/vmal_multi_view_data_edge_sptr.h
/usr/include/vxl/contrib/gel/vmal/vmal_multi_view_data_vertex_sptr.h
/usr/include/vxl/contrib/gel/vmal/vmal_operators.h
/usr/include/vxl/contrib/gel/vmal/vmal_rectifier.h
/usr/include/vxl/contrib/gel/vmal/vmal_refine_lines.h
/usr/include/vxl/contrib/gel/vmal/vmal_track_lines.h