Read the changelog to check for package removal

Slackware64-current is in the midst of very active development. Packages are being upgraded and or added on an almost daily basis.
Sometimes Mr. Volkerding also removes packages; this is noted in the -current changelog.
For example:

Code:Sat Jan 11 21:58:08 UTC 2020
a/aaa_elflibs-15.0-x86_64-18.txz: Rebuilt.
Added: libdb-4.8.so
Upgraded: libcap.so.2.30
Removed: libdb-4.2.so
a/mcelog-168-x86_64-1.txz: Upgraded.
ap/vim-8.2.0111-x86_64-1.txz: Upgraded.
d/subversion-1.13.0-x86_64-3.txz: Rebuilt.
Recompiled against db48-4.8.30.
l/apr-util-1.6.1-x86_64-8.txz: Rebuilt.
Recompiled against db48-4.8.30.
l/db42-4.2.52-x86_64-4.txz: Removed.
l/db44-4.4.20-x86_64-4.txz: Removed.
l/redland-1.0.17-x86_64-6.txz: Rebuilt.
Recompiled against db48-4.8.30.
l/serf-1.3.9-x86_64-4.txz: Rebuilt.
Recompiled against db48-4.8.30.
l/talloc-2.3.1-x86_64-3.txz: Rebuilt.
Fix documentation permissions. Thanks to Xsane.
n/httpd-2.4.41-x86_64-2.txz: Rebuilt.
Recompiled against db48-4.8.30.
n/ipset-7.5-x86_64-1.txz: Upgraded.
xap/vim-gvim-8.2.0111-x86_64-1.txz: Upgraded.
+--------------------------+To remove these packages using slackpkg run:

Code:# slackpkg clean-system