Starting off installing Plasma 6 on 15.0 requires users install/upgrade 
all the "testing" packages, especially the "graphics-updates" ones over
the stock system and usual security patch updates.

Packages listed with the "_lngn" suffix are either new or upgraded
Slackware packages which are required deps for Plasma 6. Packages 
either needed qt6 support or updates to meet the plasma requirements.

Packages with "_SBo" suffix are the same available on slackbuilds.org,
these were used for any other extra deps like qt6 and others.

Please run "upgradepkg --install-new --reinstall *.t?z" in order to
install all required packages.