Fix a unix build error.

Author: c-lipka

source/base/colour.h

@@ -1994,7 +1994,7 @@ class GenericCompactColour
         typedef CHANNEL_T Channel;
         typedef GenericLinearColour<MODEL_T,ColourChannel> ExpandedColour;
 
-        friend class ExpandedColour;
+        friend class GenericLinearColour<MODEL_T,ColourChannel>;
 
         static const unsigned int kBias              = Parameters::kBias;
         static const bool         kQuantizeToNearest = Parameters::kQuantizeToNearest;

source/base/version.h

@@ -45,7 +45,7 @@
 #define OFFICIAL_VERSION_STRING "3.7.1"
 #define OFFICIAL_VERSION_NUMBER 371
 
-#define POV_RAY_PRERELEASE "alpha.8747741"
+#define POV_RAY_PRERELEASE "alpha.8747742"
 
 #if (POV_RAY_IS_AUTOBUILD == 1) && ((POV_RAY_IS_OFFICIAL == 1) || (POV_RAY_IS_SEMI_OFFICIAL == 1))
 #ifdef POV_RAY_PRERELEASE

unix/VERSION

@@ -1 +1 @@
-3.7.1-alpha.8747741
+3.7.1-alpha.8747742