Switch to library requirements instead of source. As source puts extra source in install targets.

build.jam

@@ -7,9 +7,9 @@ import project ;
 
 project /boost/typeof
     : common-requirements
-        <source>/boost/config//boost_config
-        <source>/boost/preprocessor//boost_preprocessor
-        <source>/boost/type_traits//boost_type_traits
+        <library>/boost/config//boost_config
+        <library>/boost/preprocessor//boost_preprocessor
+        <library>/boost/type_traits//boost_type_traits
         <include>include
     ;