Comment # 1 on bug 966939 from Raymond Wooninck

Unfortunately gwenview5 uses the plugins from kipi-plugins. As long as
kipi-plugins is KDE4 based, the KF5 based gwenview5 will not have any plugins
to export files. 

On the other hand gwenview itself is no longer building as that required
libraries have already migrated to KF5. 

Fortunately kipi-plugins has already been ported and is currently in a beta
cycle, with the indications that there would  be an official release for the
KF5 version of Digikam and kipi-plugins in March. As soon as that happens (or
if RC versions are released) we can resolve this issue.