--- a/src/raytracer.cc	Sun May 31 16:53:05 2009 +0200
+++ b/src/raytracer.cc	Sun May 31 23:06:03 2009 +0200
@@ -27,6 +27,7 @@
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <assert.h>
 #include "raytracer.h"
 
@@ -478,7 +479,7 @@
 		for (;;)
 		{
 			my_count = 0;
-			while ( more_samples = sampler->nextSample(&sample_queue[my_pos++]) )
+			while ( (more_samples = sampler->nextSample(&sample_queue[my_pos++])) != 0 )
 			{
 				my_count++;
 				if (my_pos >= sample_queue_size)