Hi Ricardo, Please find my changes in the patch file attached. > (Generally, you really shouldn’t be developing things as > “root”.) > This time I din't do it as root. > For this commit a message like this would be appropriate: Added a appropriate commit message. > Please always add a so-called docstring for all defined procedures. Please bear me for this time. I din't add this yet. > You have probably noticed that this looks rather repetitive at this > point. Maybe we can think of a better way to express what colours > should be applied. The match group numbers are monotonically > increasing, so maybe we can avoid repeated statements of this kind and > simply iterate over a list of colours… I have an idea already; how > about you? :) I have an idea about making a using filter-string and lists. Not sure about functionality but that seems fine. :-P > Another thing that’s worth thinking about now is the next step: > how can we *optionally* hide all lines between these build system > notices about started and completed build phases? I din't think of it yet. Will do it in mean process. > One more thing: the fact that handle-string didn’t do the right thing > indicates that you didn’t test the changes well enough. To test them, > please locally modify “guix/scripts/build.scm” and/or > “guix/scripts/package.scm” to make it use your colourful port instead of > the default, as discussed on IRC and in previous emails. I made changes to /guix/scripts/build.scm  /but that din/t workout. That resulted me colourless outputs as before. :-( Thanks! Sahithi