Source compatibility with older Qt

src/main.cpp

@@ -19,7 +19,12 @@ int main(int argc, char *argv[])
     #endif
 
     // QRandomGenerator generates a secure random number, which we use to seed.
+#if QT_VERSION >= 0x051000    
     unsigned int seed = QRandomGenerator::securelySeeded().generate();
+#else
+    // This will be used only during debugging for compatibility reasons 
+    unsigned int seed = std::time(0);
+#endif
     std::srand(seed);
 
     Settings::init();

src/precompiled.h

@@ -7,6 +7,12 @@
 #include <ctime>
 #include <cmath>
 
+#include <QtGlobal>
+
+#if QT_VERSION >= 0x051000
+#include <QRandomGenerator>
+#endif
+
 #include <QFontDatabase>
 #include <QAbstractTableModel>
 #include <QClipboard>
@@ -19,7 +25,6 @@
 #include <QScrollBar>
 #include <QPainter>
 #include <QMovie>
-#include <QRandomGenerator>
 #include <QPair>
 #include <QDir>
 #include <QMenu>