diff --git a/src/build/alias.py b/src/build/alias.py
index f83a25bef..575e53609 100755
--- a/src/build/alias.py
+++ b/src/build/alias.py
@@ -46,13 +46,11 @@ class AliasTarget(targets.BasicTarget):
         return base.add(subvariant.sources_usage_requirements())
 
 @metatarget
-def alias(name, sources, requirements=None, default_build=None, usage_requirements=None):
+def alias(name, sources=[], requirements=[], default_build=[], usage_requirements=[]):
+
     project = get_manager().projects().current()
     targets = get_manager().targets()
 
-    if default_build:
-        default_build = default_build[0]
-
     targets.main_target_alternative(AliasTarget(
         name, project,
         targets.main_target_sources(sources, name, no_renaming=True),
diff --git a/src/build/project.py b/src/build/project.py
index 8199579cf..f08e918ae 100644
--- a/src/build/project.py
+++ b/src/build/project.py
@@ -421,7 +421,7 @@ actual value %s""" % (jamfile_module, saved_project, self.current_project))
 
         attributes.set("requirements", property_set.empty(), exact=True)
         attributes.set("usage-requirements", property_set.empty(), exact=True)
-        attributes.set("default-build", [], exact=True)
+        attributes.set("default-build", property_set.empty(), exact=True)
         attributes.set("projects-to-build", [], exact=True)
         attributes.set("project-root", None, exact=True)
         attributes.set("build-dir", None, exact=True)
@@ -860,7 +860,7 @@ class ProjectRules:
     def add_rule_for_type(self, type):
         rule_name = type.lower().replace("_", "-")
 
-        def xpto (name, sources = [], requirements = [], default_build = None, usage_requirements = []):
+        def xpto (name, sources = [], requirements = [], default_build = [], usage_requirements = []):
             return self.manager_.targets().create_typed_target(
                 type, self.registry.current(), name[0], sources,
                 requirements, default_build, usage_requirements) 
diff --git a/src/build/targets.py b/src/build/targets.py
index 716cc2645..a35612cea 100644
--- a/src/build/targets.py
+++ b/src/build/targets.py
@@ -185,12 +185,9 @@ class TargetRegistry:
             project:        Project where the main target is to be declared
         """
         if specification:
-            result = specification
-
+            return property_set.create_with_validation(specification)
         else:
-            result = project.get ('default-build')
-
-        return property_set.create_with_validation (result)
+            return project.get ('default-build')
 
     def start_building (self, main_target_instance):
         """ Helper rules to detect cycles in main target references.
@@ -663,6 +660,9 @@ class MainTarget (AbstractTarget):
         if len (self.alternatives_) == 1:
             return self.alternatives_ [0]
 
+        if debug:
+            print "Property set for selection:", property_set
+
         for v in self.alternatives_:
             properties = v.match (property_set, debug)
                        
@@ -853,7 +853,12 @@ class BasicTarget (AbstractTarget):
         # A cache for build requests
         self.request_cache = {}
 
-        self.user_context_ = self.manager_.errors().capture_user_context()
+        # Result of 'capture_user_context' has everything. For example, if this
+        # target is declare as result of loading Jamfile which was loaded when
+        # building target B which was requested from A, then we'll have A, B and
+        # Jamroot location in context. We only care about Jamroot location, most
+        # of the times.
+        self.user_context_ = self.manager_.errors().capture_user_context()[-1:]
 
         self.always_ = False
 
@@ -1030,7 +1035,7 @@ class BasicTarget (AbstractTarget):
         condition = b2.util.set.difference (bcondition, ccondition)
 
         if debug:
-            print "    next alternative: required properties:", str(condition)
+            print "    next alternative: required properties:", [str(p) for p in condition]
         
         if b2.util.set.contains (condition, property_set.all()):
 
@@ -1360,7 +1365,20 @@ def create_typed_metatarget(name, type, sources, requirements, default_build, us
                     t.main_target_requirements(requirements, project),
                     t.main_target_default_build(default_build, project),
                     t.main_target_usage_requirements(usage_requirements, project)))
+
+
+def create_metatarget(klass, name, sources, requirements=[], default_build=[], usage_requirements=[]):
+    from b2.manager import get_manager
+    t = get_manager().targets()
     
+    project = get_manager().projects().current()
+        
+    return t.main_target_alternative(
+        klass(name, project,
+              t.main_target_sources(sources, name),
+              t.main_target_requirements(requirements, project),
+              t.main_target_default_build(default_build, project),
+              t.main_target_usage_requirements(usage_requirements, project)))    
 
 def metatarget_function_for_class(class_):
 
diff --git a/src/build/virtual_target.py b/src/build/virtual_target.py
index 6d9c65ebf..f688130ab 100644
--- a/src/build/virtual_target.py
+++ b/src/build/virtual_target.py
@@ -535,7 +535,7 @@ class AbstractFileTarget (VirtualTarget):
         if tag:
 
             if len(tag) > 1:
-                self.manager_.errors()(
+                get_manager().errors()(
                     """<tag>@rulename is present but is not the only <tag> feature""")
 
             tag = tag[0]