graphics/graphviz parser error

[Marc Baudoin <babafou%babafou.eu.org@localhost>]

Hi,

For quite a few months now, graphics/graphviz has been unable to
display files generated by pkgtools/pkgdepgraph correctly.  More
precisely, graphical objects (ellipses, lines, arrows) are drawn
but the text is not and this is written on stdout:

dotty.lefty: draw language parser error: t
dotty.lefty: draw language parser error: t
dotty.lefty: draw language parser error: t
[...]

Here's a sample input file that shows the problem:

digraph "out of date packages" {
label = "out of date packages graph, generated by pkgdepgraph v2.8, on Sun Feb  
2 04:44:51 2014";
"ap22-perl-2.0.8nb1" [color="purple",label="www/ap2-perl\nap22-perl-2.0.8nb1"]; 
// #2, group 1, 174 members, 207 pkgs
}

As I'm using graphviz only to display files from pkgdepgraph, I
can't tell if the problem comes from the former or the latter.