I've screwed up another OS, haven't I?
I installed Pop!_OS 21.04 (based on Ubuntu Hirsute) two days ago, and I'm trying to build a QML app I programmed on FreeBSD. qmake doesn't make the project, complaining that
error: Project ERROR: Unknown module(s) in QT: core gui quick
I installed Qt Creator through apt.
KDE works fine, so does LXQt. Flatpak Qt Creator also works.
The same issue happens on Debian, so I'm assuming it'll happen in every Debian-based OS.