diff -rupN --no-dereference qbs-src-1.15.0/tests/auto/blackbox/testdata-qt/plugin-meta-data/app.cpp qbs-src-1.15.0-new/tests/auto/blackbox/testdata-qt/plugin-meta-data/app.cpp
--- qbs-src-1.15.0/tests/auto/blackbox/testdata-qt/plugin-meta-data/app.cpp	2019-12-10 13:29:19.000000000 +0100
+++ qbs-src-1.15.0-new/tests/auto/blackbox/testdata-qt/plugin-meta-data/app.cpp	2019-12-13 18:01:59.715649905 +0100
@@ -32,6 +32,7 @@
 #include <QJsonValue>
 #include <QPluginLoader>
 #include <QStaticPlugin>
+#include <QTextStream>
 #include <QtDebug>
 
 #ifdef QT_STATIC
@@ -78,6 +79,6 @@ int main(int argc, char *argv[])
         qDebug() << "metadata:" << metaData;
         return 1;
     }
-    qDebug() << "all ok!";
+    QTextStream(stderr) << "all ok!" << endl;
     return 0;
 }