On Sat, Nov 25, 2017, 11:19 Giorgio Cittadini <giocitta@gmail.com> wrote:
after the last sysup
 I get a refuse: "error while loading
shared libraries: libicui18n.so.58: cannot open shared object file: No
such file or directory". My system now uses icu-61.0. What to do?

Use the revdep program to see what ports must be rebuilt (with prt-get update -fr).

The updates on CRUX differ from other distributions like a manual transmission car from an automatic one :)  You must use  'prt-get diff' to see if ports were deleted, renamed or merged, you must check if the updates have new dependencies (which are not automatically installed with sysup), and after sysup you must run revdep to see what needs to be rebuilt, and run rejmerge to merge  the config files.