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

Author: grafikrobot

build.jam

@@ -5,20 +5,23 @@
 
 require-b2 5.2 ;
 
+constant boost_dependencies :
+    /boost/assert//boost_assert
+    /boost/config//boost_config
+    /boost/iterator//boost_iterator
+    /boost/throw_exception//boost_throw_exception
+    /boost/type_traits//boost_type_traits ;
+
 project /boost/tokenizer
     : common-requirements
-        <library>/boost/assert//boost_assert
-        <library>/boost/config//boost_config
-        <library>/boost/iterator//boost_iterator
-        <library>/boost/throw_exception//boost_throw_exception
-        <library>/boost/type_traits//boost_type_traits
         <include>include
     ;
 
 explicit
-    [ alias boost_tokenizer ]
+    [ alias boost_tokenizer : : : : <library>$(boost_dependencies) ]
     [ alias all : boost_tokenizer example test ]
     ;
 
 call-if : boost-library tokenizer
     ;
+