I have some Trinity build peculiarities too, although
krusader is not one of them. pytdeextensions, tdebindings, tdenetwork, amarok. They build in one Slackware release but not necessarily in another. Hopefully we get these anomalies figured out soon. :-)
I'll wager the amarok failure is due to musicbrainz tunepimp dependency no longer building against libmp4v2 that I posted about in the other thread. Amarok should build fine on earlier slack releases, but probably not the latest.
I don't build amarok with the musicbrainz dependency because musicbrainz is not part of the stock Slackware.
For me, amarok and tdenetwork refuse to build unless I reverse commit 477d071b (bug report 1040). I don't need to reverse that patch for any other package.
Darrell