Calibre e-book manager https://calibre-ebook.com/ is not installable in the
current Tumbleweed due to missing libicu >= 4.4:

sudo zypper se -s calibre
Loading repository data...
Reading installed packages...

S | Name    | Type    | Version    | Arch   | Repository
--+---------+---------+------------+--------+-----------
  | calibre | package | 3.46.0-1.2 | x86_64 | tw-oss
  | calibre | package | 3.46.0-1.2 | i586   | tw-oss

sudo zypper in calibre
Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides libicu >= 4.4 needed by calibre-3.46.0-1.2.x86_64
 Solution 1: do not install calibre-3.46.0-1.2.x86_64
 Solution 2: break calibre-3.46.0-1.2.x86_64 by ignoring some of its
dependencies

Choose from above solutions by number or cancel [1/2/c/d/?] (c):