Fix build when using old linux systems

src/gui/PianoRoll.cpp

@@ -70,6 +70,11 @@
 #include "text_float.h"
 
 
+#if QT_VERSION < 0x040800
+#define MiddleButton MidButton
+#endif
+
+
 typedef AutomationPattern::timeMap timeMap;
 
 

src/gui/plugin_browser.cpp

@@ -28,6 +28,8 @@
 #include <QtGui/QMouseEvent>
 #include <QtGui/QScrollArea>
 
+#include <algorithm> // for std::sort
+
 #include "plugin_browser.h"
 #include "embed.h"
 #include "debug.h"