Forward declare C functions for GCC's sake

src/interface/Cursors.cpp

@@ -23,8 +23,6 @@ namespace Cursors
     constexpr sint32 CURSOR_WIDTH = 32;
     constexpr sint32 CURSOR_HEIGHT = 32;
 
-    static const CursorData * RawCursorData[CURSOR_COUNT];
-
     static SDL_Cursor * _loadedCursors[CURSOR_COUNT];
     static bool         _initialised = false;
     static CURSOR_ID    _currentCursor = CURSOR_UNDEFINED;

src/interface/Cursors.h

@@ -74,11 +74,18 @@ namespace Cursors
     void        SetCurrentCursor(CURSOR_ID cursorId);
 }
 
-#else
+#endif
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
 
     void    cursors_initialise();
     void    cursors_dispose();
     int     cursors_getcurrentcursor();
     void    cursors_setcurrentcursor(int cursorId);
 
+#ifdef __cplusplus
+}
 #endif