Initially this was just a clone (fork) from the sourceforge-project of Robert Keevil and others. I adapted the code to make it buildable with Qt5 (before Qt4).
QTScrobbler ships both multiplatform GUI and CLI versions and requires Qt >= 5.5.
Optional MTP support requires libmtp-dev and pkg-config (or the Windows 7 SDK if using MS Visual C++).
sudo apt-get install libmtp-dev pkg-config
cd src && qmake && make
cd qt && qmake && make
With the most recent changes the MTP support (at least for Win) is dropped. It builds, but you have to pick the scrobbler.log manually on the device.
This is acceptable for me. I am also thinking about dropping the support for macOS and Win at all.
Additionally future porting to Qt6 (OpenSource) is planned.
Update: last.fm has stopped the support of groups and closed all existing ones. So there is no other way than github to exchange ideas.