Qt version check

src/main.cpp

+#include <QtGlobal>
 #include <QString>
 #include <QStringList>
 #include <QUrl>
@@ -16,9 +17,9 @@
 int main(int argc, char *argv[])
 {
     // Init
-    if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)) {
-        QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-    }
+#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+#endif
     QGuiApplication app(argc, argv);
     Core::Config *config = new Core::Config(":/configs");
     Core::Network *network = new Core::Network(true);