http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=26830

diff --git a/MagickCore/pixel.h b/MagickCore/pixel.h
index 3685e32..b150f13 100644
--- a/MagickCore/pixel.h
+++ b/MagickCore/pixel.h
@@ -228,6 +228,8 @@
   SetPixelMetaChannels(Image *,const size_t,ExceptionInfo *);
 
 extern MagickExport MagickRealType
+  GetPixelInfoIntensity(const Image *restrict,const PixelInfo *restrict)
+    magick_hot_spot,
   GetPixelIntensity(const Image *restrict,const Quantum *restrict)
     magick_hot_spot;