Move inter-lib dependencies to a project variable and into the build …

…targets.

build.jam

@@ -5,27 +5,30 @@
 
 require-b2 5.2 ;
 
+constant boost_dependencies :
+    /boost/config//boost_config
+    /boost/container_hash//boost_container_hash
+    /boost/core//boost_core
+    /boost/function_types//boost_function_types
+    /boost/functional//boost_functional
+    /boost/mpl//boost_mpl
+    /boost/preprocessor//boost_preprocessor
+    /boost/static_assert//boost_static_assert
+    /boost/tuple//boost_tuple
+    /boost/type_traits//boost_type_traits
+    /boost/typeof//boost_typeof
+    /boost/utility//boost_utility ;
+
 project /boost/fusion
     : common-requirements
-        <library>/boost/config//boost_config
-        <library>/boost/container_hash//boost_container_hash
-        <library>/boost/core//boost_core
-        <library>/boost/function_types//boost_function_types
-        <library>/boost/functional//boost_functional
-        <library>/boost/mpl//boost_mpl
-        <library>/boost/preprocessor//boost_preprocessor
-        <library>/boost/static_assert//boost_static_assert
-        <library>/boost/tuple//boost_tuple
-        <library>/boost/type_traits//boost_type_traits
-        <library>/boost/typeof//boost_typeof
-        <library>/boost/utility//boost_utility
         <include>include
     ;
 
 explicit
-    [ alias boost_fusion ]
+    [ alias boost_fusion : : : : <library>$(boost_dependencies) ]
     [ alias all : boost_fusion test ]
     ;
 
 call-if : boost-library fusion
     ;
+