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diff --git a/jam-files/boost-build/build/alias.jam b/jam-files/boost-build/build/alias.jam
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--- a/jam-files/boost-build/build/alias.jam
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-# Copyright 2003, 2004, 2006 Vladimir Prus
-# Distributed under the Boost Software License, Version 1.0.
-# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
-
-# This module defines the 'alias' rule and the associated target class.
-#
-# Alias is just a main target which returns its source targets without any
-# processing. For example:
-#
-#   alias bin : hello test_hello ;
-#   alias lib : helpers xml_parser ;
-#
-# Another important use of 'alias' is to conveniently group source files:
-#
-#   alias platform-src : win.cpp : <os>NT ;
-#   alias platform-src : linux.cpp : <os>LINUX ;
-#   exe main : main.cpp platform-src ;
-#
-# Lastly, it is possible to create a local alias for some target, with different
-# properties:
-#
-#   alias big_lib : : @/external_project/big_lib/<link>static ;
-#
-
-import "class" : new ;
-import project ;
-import property-set ;
-import targets ;
-
-
-class alias-target-class : basic-target
-{
-    rule __init__ ( name : project : sources * : requirements *
-        : default-build * : usage-requirements * )
-    {
-        basic-target.__init__ $(name) : $(project) : $(sources) :
-            $(requirements) : $(default-build) : $(usage-requirements) ;
-    }
-
-    rule construct ( name : source-targets * : property-set )
-    {
-        return [ property-set.empty ] $(source-targets) ;
-    }
-
-    rule compute-usage-requirements ( subvariant )
-    {
-        local base = [ basic-target.compute-usage-requirements $(subvariant) ] ;
-        return [ $(base).add [ $(subvariant).sources-usage-requirements ] ] ;
-    }
-}
-
-
-# Declares the 'alias' target. It will process its sources virtual-targets by
-# returning them unaltered as its own constructed virtual-targets.
-#
-rule alias ( name : sources * : requirements * : default-build * :
-    usage-requirements * )
-{
-    local project = [ project.current ] ;
-
-    targets.main-target-alternative
-        [ new alias-target-class $(name) : $(project)
-            : [ targets.main-target-sources $(sources) : $(name) : no-renaming ]
-            : [ targets.main-target-requirements $(requirements) : $(project) ]
-            : [ targets.main-target-default-build $(default-build) : $(project)
-                ]
-            : [ targets.main-target-usage-requirements $(usage-requirements) :
-                $(project) ]
-        ] ;
-}
-
-
-IMPORT $(__name__) : alias : : alias ;