Index: giflib-5.2.1/gif_lib.h
===================================================================
--- giflib-5.2.1.orig/gif_lib.h
+++ giflib-5.2.1/gif_lib.h
@@ -295,6 +295,14 @@ extern void GifDrawBoxedText8x8(SavedIma
                           const char *legend,
                           const int border, const int bg, const int fg);
 
+/******************************************************************************
+ Color table quantization
+******************************************************************************/
+int GifQuantizeBuffer(unsigned int Width, unsigned int Height,
+                   int *ColorMapSize, GifByteType * RedInput,
+                   GifByteType * GreenInput, GifByteType * BlueInput,
+                   GifByteType * OutputBuffer,
+                   GifColorType * OutputColorMap);
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */