bacula-15.0.3-qt6-gentoo.patch from https://dev.gentoo.org/~tomjbe/distfiles/

Index: src/qt-console/util/comboutil.h
--- src/qt-console/util/comboutil.h.orig
+++ src/qt-console/util/comboutil.h
@@ -24,7 +24,7 @@
 
 class QComboBox;
 class QString;
-class QStringList;
+//class QStringList;
 
 /* selects value val on combo, if exists */
 void comboSel(QComboBox *combo, const QString &val);
