fix builds on osx 10.4

include/Mw/LowLevel/Cocoa.h

@@ -86,18 +86,17 @@
 @end
 
 @interface MilskoCocoaView : NSView {
-	NSBitmapImageRep*	   rep;
-	NSGraphicsContext*	   context;
-	MwBool			   valid;
-	CGColorSpaceRef		   space;
-	CGDataProviderRef	   provider;
-	NSRect			   givenRect;
-	float			   x;
-	float			   y;
-	float			   width;
-	float			   height;
-	MwBool			   _child;
-	IBOutlet NSViewController* viewController;
+	NSBitmapImageRep*  rep;
+	NSGraphicsContext* context;
+	MwBool		   valid;
+	CGColorSpaceRef	   space;
+	CGDataProviderRef  provider;
+	NSRect		   givenRect;
+	float		   x;
+	float		   y;
+	float		   width;
+	float		   height;
+	MwBool		   _child;
 }
 
 - (void)initRepAndContextWithWidth:(float)w Height:(float)h;

include/Mw/MachDep.h

@@ -57,17 +57,26 @@
 #define M_PI 3.14159265
 #endif
 
+/* Windows */
 #if defined(_MILSKO) && defined(_WIN32)
 #define MWDECL extern __declspec(dllexport)
 #elif defined(_WIN32)
 #define MWDECL extern __declspec(dllimport)
+/* GCC/Clang */
+/* First check if we have __has_attribute and can check for the existence of visibility  */
 #elif defined(__has_attribute)
 #if __has_attribute(visibility)
 #define MWDECL extern __attribute__((visibility("default")))
 #else
 #define MWDECL extern
 #endif
+/* It might be that we're on an old version of GCC (like the one Apple ships with older versions of Mac OS).
+ * If we're on gcc 3 or above, assume it's there
+ */
+#elif __GNUC__ >= 3
+#define MWDECL extern __attribute__((visibility("default")))
 #else
+/* all else fails */
 #define MWDECL extern
 #endif