diff -up qtbase-everywhere-src-5.15.6/src/corelib/kernel/qobject_p.h.private_api_warning qtbase-everywhere-src-5.15.6/src/corelib/kernel/qobject_p.h
--- qtbase-everywhere-src-5.15.6/src/corelib/kernel/qobject_p.h.private_api_warning	2022-10-11 09:08:33.712070523 -0500
+++ qtbase-everywhere-src-5.15.6/src/corelib/kernel/qobject_p.h	2022-10-11 09:10:58.647038619 -0500
@@ -435,7 +435,7 @@ inline void QObjectPrivate::checkForInco
     Q_UNUSED(version);
 #else
     if (Q_UNLIKELY(version != QObjectPrivateVersion)) {
-        qFatal("Cannot mix incompatible Qt library (%d.%d.%d) with this library (%d.%d.%d)",
+        qWarning("Cannot mix incompatible Qt library (%d.%d.%d) with this library (%d.%d.%d)",
                 (version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff,
                 (QObjectPrivateVersion >> 16) & 0xff, (QObjectPrivateVersion >> 8) & 0xff, QObjectPrivateVersion & 0xff);
     }