editing xpm files

What is the best way of editing xpm files, given the current bug in Gimp that prevents saving an xpm file? Suse 9.1 Prof, 2.6.5-7.111.19-smp, gimp-2.0.0-11. I just want to make simple hue/lightness/saturation changes. - Richard -- Richard Kimber http://www.psr.keele.ac.uk/