gdiplus: Implemented GdipSetPenColor.
diff --git a/include/gdiplusflat.h b/include/gdiplusflat.h
index bfd1211..446cb98 100644
--- a/include/gdiplusflat.h
+++ b/include/gdiplusflat.h
@@ -34,6 +34,7 @@
 GpStatus WINGDIPAPI GdipGetPenColor(GpPen*,ARGB*);
 GpStatus WINGDIPAPI GdipGetPenDashStyle(GpPen*,GpDashStyle*);
 GpStatus WINGDIPAPI GdipSetPenBrushFill(GpPen*,GpBrush*);
+GpStatus WINGDIPAPI GdipSetPenColor(GpPen*,ARGB);
 GpStatus WINGDIPAPI GdipSetPenCustomEndCap(GpPen*,GpCustomLineCap*);
 GpStatus WINGDIPAPI GdipSetPenCustomStartCap(GpPen*,GpCustomLineCap*);
 GpStatus WINGDIPAPI GdipSetPenDashStyle(GpPen*,GpDashStyle);