tce-load -wi compiletc cmake git ninja pkg-config boost-1.78-dev openssl-1.1.1-dev zlib_base-dev libGL-dev qt-5.x-dev

https://github.com/qbittorrent/qBittorrent/archive/refs/tags/release-4.3.9.tar.gz [4.4.0 onwards require Qt5 5.15.2)

cd qBittorrent-release-4.3.9

cmake -G "Ninja" -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_FLAGS='-flto -mtune=generic -Os' -DCMAKE_CXX_FLAGS='-flto -mtune=generic -Os' -DCMAKE_INSTALL_PREFIX=/usr/local

payload is qBittorrent-release-4.3.9/build/qbittorrent

manually add:
/usr/local/share/applications/qbittorrent.desktop
/usr/local/share/pixmaps/qbittorrent.png
startup script (it seems necessary to actually copy the icon to appropriate dir in order for icon to show up in panel bar)