--- a/sdlterm/src/sdlterm.cc	Sun Jan 06 13:55:02 2013 +0100
+++ b/sdlterm/src/sdlterm.cc	Sun Jan 06 23:03:24 2013 +0100
@@ -4,7 +4,7 @@
 #include <algorithm>
 
 
-void ColorMap::index_to_rgb(int index, SDL_Color &color)
+void ColorMap::index_to_rgb(int index, SDL_Color &color) const
 {
     color.r = _map[index][0];
     color.g = _map[index][1];