Fixes scopegadget loading issues with Qt versions > 4.7.4

ground/openpilotgcs/src/libs/qwt/qwtconfig.pri

@@ -30,6 +30,14 @@ VVERSION = $$[QT_VERSION]
 
 CONFIG       += QwtPlot
 
+######################################################################
+# Build the static/shared libraries.
+# If QwtDll is enabled, a shared library is built, otherwise
+# it will be a static library.
+######################################################################
+
+QWT_CONFIG           += QwtDll
+
 ######################################################################
 # QwtWidgets enables all classes, that are needed to use the all other
 # widgets (sliders, dials, ...), beside QwtPlot. 

ground/openpilotgcs/src/libs/qwt/src/qwt_global.h

@@ -29,17 +29,14 @@
 #pragma warning(disable: 4660)
 #endif // _MSC_VER
 
-#ifdef QWT_DLL
 
 #if defined(QWT_MAKEDLL)     // create a Qwt DLL library 
-#define QWT_EXPORT  __declspec(dllexport)
+#define QWT_EXPORT Q_DECL_EXPORT
 #define QWT_TEMPLATEDLL
 #else                        // use a Qwt DLL library
-#define QWT_EXPORT  __declspec(dllimport)
+#define QWT_EXPORT Q_DECL_IMPORT
 #endif
 
-#endif // QWT_DLL
-
 #endif // Q_WS_WIN
 
 #ifndef QWT_EXPORT

ground/openpilotgcs/src/libs/qwt/src/src.pro

@@ -4,9 +4,14 @@ DEFINES += QWT_LIBRARY
 include(../../../openpilotgcslibrary.pri)
 include( ../qwtconfig.pri )
 
-#VVERSION = $$[QT_VERSION]
-
+contains(QWT_CONFIG, QwtDll) {
 
+    CONFIG += dll
+    win32|symbian: DEFINES += QT_DLL QWT_DLL QWT_MAKEDLL
+}
+else {
+    CONFIG += staticlib
+}
 HEADERS += \
     qwt.h \
     qwt_abstract_scale_draw.h \