Index: pym/_emerge/__init__.py
===================================================================
--- pym/_emerge/__init__.py	(revision 11953)
+++ pym/_emerge/__init__.py	(revision 11960)
@@ -4330,7 +4330,7 @@
 		self._show_merge_list()
 
 		msg = []
-		msg.append("\n!!! Multiple versions within a single " + \
+		msg.append("\n!!! Multiple package instances within a single " + \
 			"package slot have been pulled\n")
 		msg.append("!!! into the dependency graph, resulting" + \
 			" in a slot conflict:\n\n")
@@ -4589,6 +4589,23 @@
 							priority=priority)
 					return 1
 				else:
+
+					if pkg.cpv == existing_node.cpv and \
+						dep.atom is not None and \
+						dep.atom.use:
+						# Multiple different instances of the same version
+						# (typically one installed and another not yet
+						# installed) have been pulled into the graph due
+						# to a USE dependency. The "slot collision" display
+						# is not helpful in a case like this, so display it
+						# as an unsatisfied dependency.
+						self._unsatisfied_deps_for_display.append(
+							((dep.root, dep.atom), {"myparent":dep.parent}))
+						self._slot_collision_info.add((pkg.slot_atom, pkg.root))
+						self._slot_collision_nodes.add(pkg)
+						self.digraph.addnode(pkg, myparent, priority=priority)
+						return 0
+
 					if pkg in self._slot_collision_nodes:
 						return 1
 					# A slot collision has occurred.  Sometimes this coincides