fix build with Qt <5.6

jef-n · jef-n · commit 1113e5bae8be · 2018-10-24T10:27:35.000+02:00
diff --git a/src/core/qgsrenderchecker.cpp b/src/core/qgsrenderchecker.cpp
@@ -194,7 +194,9 @@ bool QgsRenderChecker::runTest( const QString &testName,
   mElapsedTime = myTime.elapsed();
 
   QImage myImage = job.renderedImage();
+#if QT_VERSION >= 0x050600
   Q_ASSERT( myImage.devicePixelRatioF() == mMapSettings.devicePixelRatio() );
+#endif
 
   //
   // Save the pixmap to disk so the user can make a
