gdk::color_parse
GdkColor gdk::color_parse(string color_spec);
This function creates a new GdkColor structure
and fills it according to the color named in the
color_spec parameter. The string that is passed
as the parameter can be the hex triplet version of the color, e.g.
'#FF0000', or the equivalent color name linked in
rgb.txt, e.g. 'red'.
Win32 users will not be able to find that file, as it is compiled.
There is a good rgb.txt reference page
here.