diff --git a/gtk/src/gtk_control.cpp b/gtk/src/gtk_control.cpp
index 13d935f1..906a2846 100644
--- a/gtk/src/gtk_control.cpp
+++ b/gtk/src/gtk_control.cpp
@@ -469,7 +469,7 @@ JoyDevice::~JoyDevice (void)
 }
 
 void
-JoyDevice::add_event (int parameter, int state)
+JoyDevice::add_event (unsigned int parameter, unsigned int state)
 {
     JoyEvent event = { parameter, state };
 
diff --git a/gtk/src/gtk_control.h b/gtk/src/gtk_control.h
index 916ad192..3afaa9e3 100644
--- a/gtk/src/gtk_control.h
+++ b/gtk/src/gtk_control.h
@@ -87,7 +87,7 @@ class JoyDevice
 
     private:
         void poll_events (void);
-        void add_event (int parameter, int state);
+        void add_event (unsigned int parameter, unsigned int state);
 
 };
 #endif
diff --git a/gtk/src/gtk_display.cpp b/gtk/src/gtk_display.cpp
index c2897e1b..31e3947d 100644
--- a/gtk/src/gtk_display.cpp
+++ b/gtk/src/gtk_display.cpp
@@ -718,6 +718,7 @@ S9xMergeHires (void *buffer,
     return;
 }
 
+#if 0
 static void
 S9xBlendHires (void *buffer, int pitch, int &width, int &height)
 {
@@ -751,6 +752,7 @@ S9xBlendHires (void *buffer, int pitch, int &width, int &height)
 
     return;
 }
+#endif
 
 void
 filter_2x (void *src,
diff --git a/gtk/src/gtk_display_driver.h b/gtk/src/gtk_display_driver.h
index 3aa11742..d36fd467 100644
--- a/gtk/src/gtk_display_driver.h
+++ b/gtk/src/gtk_display_driver.h
@@ -6,6 +6,7 @@
 class S9xDisplayDriver
 {
     public:
+        virtual ~S9xDisplayDriver() {}
         virtual void refresh (int width, int height) = 0;
         virtual int init (void) = 0;
         virtual void deinit (void) = 0;
diff --git a/gtk/src/gtk_display_driver_opengl.cpp b/gtk/src/gtk_display_driver_opengl.cpp
index 0163f7d8..34ae173a 100644
--- a/gtk/src/gtk_display_driver_opengl.cpp
+++ b/gtk/src/gtk_display_driver_opengl.cpp
@@ -318,16 +318,22 @@ S9xOpenGLDisplayDriver::update (int width, int height)
     if (using_shaders)
     {
         GLint location;
+        float inputSize[2];
+        float outputSize[2];
+        float textureSize[2];
 
-        float inputSize[2] = { width, height };
+        inputSize[0] = width;
+        inputSize[1] = height;
         location = glGetUniformLocation (program, "rubyInputSize");
         glUniform2fv (location, 1, inputSize);
 
-        float outputSize[2] = {w , h };
+        outputSize[0] = w;
+        outputSize[1] = h;
         location = glGetUniformLocation (program, "rubyOutputSize");
         glUniform2fv (location, 1, outputSize);
 
-        float textureSize[2] = { texture_width, texture_height };
+        textureSize[0] = texture_width;
+        textureSize[1] = texture_height;
         location = glGetUniformLocation (program, "rubyTextureSize");
         glUniform2fv (location, 1, textureSize);
     }
diff --git a/gtk/src/gtk_sound_driver.h b/gtk/src/gtk_sound_driver.h
index 1c66ccd8..034c7012 100644
--- a/gtk/src/gtk_sound_driver.h
+++ b/gtk/src/gtk_sound_driver.h
@@ -6,6 +6,7 @@
 class S9xSoundDriver
 {
     public:
+        virtual ~S9xSoundDriver () {}
         virtual void init (void) = 0;
         virtual void terminate (void) = 0;
         virtual bool8 open_device (void) = 0;