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diff --git a/jam-files/boost-build/build/alias.py b/jam-files/boost-build/build/alias.py
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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) 
+
+# Status: ported (danielw)
+# Base revision: 56043
+
+#  This module defines the 'alias' rule and associated 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's possible to create local alias for some target, with different
+#  properties::
+#
+#    alias big_lib : : @/external_project/big_lib/<link>static ;
+#
+
+import targets
+import property_set
+from b2.manager import get_manager
+
+from b2.util import metatarget
+
+class AliasTarget(targets.BasicTarget):
+
+    def __init__(self, *args):
+        targets.BasicTarget.__init__(self, *args)
+
+    def construct(self, name, source_targets, properties):
+        return [property_set.empty(), source_targets]
+
+    def compute_usage_requirements(self, subvariant):
+        base = targets.BasicTarget.compute_usage_requirements(self, subvariant)
+        # Add source's usage requirement. If we don't do this, "alias" does not
+        # look like 100% alias.
+        return base.add(subvariant.sources_usage_requirements())
+
+@metatarget
+def alias(name, sources=[], requirements=[], default_build=[], usage_requirements=[]):
+
+    project = get_manager().projects().current()
+    targets = get_manager().targets()
+
+    targets.main_target_alternative(AliasTarget(
+        name, project,
+        targets.main_target_sources(sources, name, no_renaming=True),
+        targets.main_target_requirements(requirements or [], project),
+        targets.main_target_default_build(default_build, project),
+        targets.main_target_usage_requirements(usage_requirements or [], project)))
+
+# Declares the 'alias' target. It will build sources, and return them unaltered.
+get_manager().projects().add_rule("alias", alias)
+