I wrote a script to look for similar problems in the 10.x repository. It reported:
echievements-locale.tcz references nonexistent package echievements.tcz
galculator-locale.tcz references nonexistent package gcalculator.tcz
lvm2-dev.tcz references nonexistent package udev-lib-dev.tcz
mariadb-10.3-dev.tcz references nonexistent package libmsgpack-dev.tcz
mariadb-10.3-dev.tcz references nonexistent package linux-pam-dev.tcz
mocp.tcz references nonexistent package libdb.tcz
owfs-dev.tcz references nonexistent package fuse-dev.tcz
tcc.tcz references nonexistent package linux-4.14.3_api_headers.tcz
webkitgtk4-dev.tcz references nonexistent package ruby-2.2-dev.tcz