Make the library modular usable.

test/Jamfile.v2

@@ -8,6 +8,11 @@
 import testing ;
 import set ;
 
+project : requirements
+    <source>/boost/core//boost_core
+    <source>/boost/lexical_cast//boost_lexical_cast
+    ;
+
 # The special requirement is not ported yet.
 #
 #local rule special-requirements ( toolset variant : properties * )