Multicolor edges

Is this a version related issue?

[email protected]:/var/www$ cat mline
digraph G {
a -> b [dir=both color="red:blue"]
c -> d [dir=none color="green:red;0.25:blue"]
[email protected]:/var/www$ dot -Tsvg mline -o mline.svg
Warning: red;0.25 is not a known color.

I'm the apt-gotten version on Debian 7. The graph syntax is copied directly from
I'd prefer not to compile a new version if I can stick with the version from apt-get.

dot - graphviz version 2.26.3 (20100126.1600)
Activated plugin library:
Using textlayout: textlayout:cairo
Activated plugin library:
Using layout: dot:dot_layout
Activated plugin library:
Using render: dot:core
Using device: dot:dot:core
The plugin configuration file:
was successfully loaded.
render : cairo dot fig gd map ps svg tk vml vrml xdot
layout : circo dot fdp neato nop nop1 nop2 osage patchwork sfdp twopi
textlayout : textlayout
device : canon cmap cmapx cmapx_np dot eps fig gd gd2 gif gv imap imap_np ismap jpe jpeg jpg pdf plain plain-ext png ps ps2 svg svgz tk vml vmlz vrml wbmp x11 xdot xlib
loadimage : (lib) eps gd gd2 gif jpe jpeg jpg png ps svg

Sorry, yes, the parallel edge

Sorry, yes, the parallel edge color was added in 2005, but the serial version wasn't added until late 2012, I believe.

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