liteide won't build with Qt 5.15: it uses internal headers and datastructures which have been removed.
kde@ will either mark it BROKEN or apply https://github.com/freebsd/freebsd-ports-kde/commit/942990c959e9978fe8e85b72fe87591aafb5678d -- which makes it build, at least, by removing the Qt 5.6-era copy of QJson that's bundled inside.
A commit references this bug:
Date: Fri Jun 5 10:21:17 UTC 2020
New revision: 538003
devel/liteide: Qt 5.15 housekeeping
- add includes because Qt 5.15 drops some implicitly included ones
- remove bundled copy of old QJson library -- use the system one
Approved by: dmgk