Missed the dependency on accumulators.

[SVN r43068]

doc/Jamfile.v2

@@ -43,7 +43,7 @@ boostbook doc
 
     ## Add path references to the QuickBook generated docs...
 
-    <implicit-dependency>../libs/accumulators/doc//accumulators
+    #<implicit-dependency>../libs/accumulators/doc//accumulators
     <implicit-dependency>../libs/functional/hash/doc//hash
     #<implicit-dependency>../libs/type_traits/doc//type_traits
     <implicit-dependency>../libs/static_assert/doc//static_assert