gdiplus: Added GdipDrawString.
diff --git a/include/gdiplusgpstubs.h b/include/gdiplusgpstubs.h
index d0fc8c4..7b08538 100644
--- a/include/gdiplusgpstubs.h
+++ b/include/gdiplusgpstubs.h
@@ -37,6 +37,7 @@
 class GpLineGradient : public GpBrush {};
 class GpTexture : public GpBrush {};
 class GpFont {};
+class GpStringFormat {};
 
 #else /* end of c++ declarations */
 
@@ -56,6 +57,7 @@
 typedef struct GpLineGradient GpLineGradient;
 typedef struct GpTexture GpTexture;
 typedef struct GpFont GpFont;
+typedef struct GpStringFormat GpStringFormat;
 
 #endif /* end of c declarations */