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

…targets.

build.jam

@@ -5,21 +5,24 @@
 
 require-b2 5.2 ;
 
+constant boost_dependencies :
+    /boost/concept_check//boost_concept_check
+    /boost/config//boost_config
+    /boost/core//boost_core
+    /boost/integer//boost_integer
+    /boost/logic//boost_logic
+    /boost/mp11//boost_mp11 ;
+
 project /boost/safe_numerics
     : common-requirements
-        <library>/boost/concept_check//boost_concept_check
-        <library>/boost/config//boost_config
-        <library>/boost/core//boost_core
-        <library>/boost/integer//boost_integer
-        <library>/boost/logic//boost_logic
-        <library>/boost/mp11//boost_mp11
         <include>include
     ;
 
 explicit
-    [ alias boost_safe_numerics ]
+    [ alias boost_safe_numerics : : : : <library>$(boost_dependencies) ]
     [ alias all : boost_safe_numerics example test ]
     ;
 
 call-if : boost-library safe_numerics
     ;
+