Zimoun, Thanks for the report! zimoun 写道: > diff -r --no-dereference > /gnu/store/1wwdmzcjhrpal92sz2zwzhyqmbc3w7ri-dune-1.11.3{,-check} Don't use ‘diff’ for this, use something like diffoscope: $ diffoscope --exclude-directory-metadata --html dune.html $old $new -> https://www.tobias.gr/dune.html I think the problem is confined to the first screenful: one header byte differs, and then $old has an extra byte that shifts everything to the right causing these huge diffs. Kind regards, T G-R