your package depends, recommends, or suggests khelpcenter4. Since the
split in an own source, it was renamed back to khelpcenter, with
khelpcenter4 as transitional package; please update the package
relationship according to this.
Attached there is a patch for this.
The khelpcenter package is already available in the current Debian
stable, i.e. Stretch.
@@ -147,7 +147,7 @@ Package: digikam-doc
Description: handbook for digiKam
digiKam is an easy to use and powerful digital photo management
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