https://framagit.org/medoc92/upplay/-/commit/849e3e5ff469a864ac8a6a91f867d8fe6698da73

Index: upplay.pro
--- upplay.pro.orig
+++ upplay.pro
@@ -214,7 +214,7 @@ unix:!mac {
   # because of possible conflict with a system lib if we installed them. Also have to use single
   # process make (no -j) when this is enabled, for some yet unelucidated reason.
   equals(QT_MAJOR_VERSION, 6) {
-  config += dbus
+    QT += dbus
     LIB_NAME = ambermpris6
     LIB_SRCDIR = $$PWD/amber-mpris
     LIB_DIR  = $$OUT_PWD/amber-mpris
