digiKam 5.7.0 doesn't show krita kra thumbnails

[Elle Stone]

On 10/25/2017 03:01 PM, Gilles Caulier wrote:
> kbuildsyscoca5 must be the command line to update the cache. but the RPM
> must call this tool after to install. Try to restart the system to force a
> complete plugin rescan.

My apologies, I don't understand. DigiKam and kimageformats were both 
already installed from Gentoo portage when I started my computer this 
morning. So I don't think restarting the computer will change anything.

Is it possible that, in order to read the .kra embedded png, digiKam 
requires some additional qt5 or kframeworks components, or other 
libraries, that I might not have installed?

Is "kbuildsyscoca5" an executable that can be run from the command line 
(I thought it was, but maybe I'm misremembering)? If it is an 
executable, apparently it's not currently installed on my system. What 
package is it in?

Best,
Elle