digraph "Grafts" {
  perl [ label = "perl", shape = box, fontname = Helvetica];
  inkscape [ label = "inkscape", shape = box, fontname = Helvetica];
  libc [ label = "glibc", shape = box, fontname = Helvetica ];

  inkscape -> perl [ color = darkviolet ];
  inkscape -> libc [ color = darkviolet ];
  perl -> libc [ color = darkviolet ];

  inkscapeg [ label = "inkscape (grafted)", shape = box, fontname = Helvetica,
              color = dimgrey, fontcolor = dimgrey, margin = 0.2 ];
  perlf [ label = "perl (fixed)", shape = box, fontname = Helvetica];

  perlf -> libc [ color = darkviolet ];
  inkscapeg -> inkscape [ color = orange ];
  inkscapeg -> perlf [ color = orange ];
}