Hi, As QT5 is going away please upgrade to QT6 as it appears to be supported upstream. https://gitlab.com/drobilla/jalv/-/blob/main/meson.build?ref_type=heads#L597
jalv doesn't support Qt6, and it seems to be abandoned. It should be removed once Qt5 is removed.
(In reply to Yuri Victorovich from comment #1) I take the previous comment back, I didn't look right. There are some recent commits, and there is this issue: https://gitlab.com/drobilla/jalv/-/issues/16 Will see if they will move to support Qt6.