:: Synchronizing package databases...
:: current is up to date
 extra                    [################] 100%     237K     0.5K/s  00:02:56
:: unstable is up to date
:: community is up to date
:: file-4.16-1: is up to date.  Upgrade anyway? [Y/n] n
error: unresolvable dependencies:
  maxima: requires clisp<=2.36 but it is not in the sync db