digraph singular {
	gmp [ color=lightgrey, fontcolor=blue, style=filled, shape=box ];
	gmp -> ntl;
	gmp -> factory_libfac;
	gmp -> coeffs;
	ntl [ color=lightgrey, fontcolor=blue, style=filled, shape=box ];
	ntl -> factory_libfac;
	omalloc_xalloc [ color=lightgrey, fontcolor=green, style=filled ];
	omalloc_xalloc -> factory_libfac [label="x"];
	omalloc_xalloc -> reporter;
	omalloc_xalloc -> resources [label="?"];
	omalloc_xalloc -> coeffs;
	omalloc_xalloc -> polys;
	factory_libfac [ color=lightgrey, fontcolor=blue, style=filled ];
	factory_libfac -> polys;
	misc -> reporter;
	misc -> resources;
	misc -> coeffs;
	misc -> polys;
	reporter -> resources;
	reporter -> coeffs;
	reporter -> polys;
	reporter -> misc;	
	resources -> coeffs;
	polys -> ext_fields;
	coeffs -> ext_fields;	
        coeffs [ fontcolor=blue ];
	coeffs -> polys;
	edge [style=dashed];
	ntl -> coeffs;
	polys [ fontcolor=blue ];
	ext_fields -> coeffs;
}

// dot -Tpng -o singular.png singular.dot

// boxed = third party
// filled = external
// blue = math