Index: pym/_emerge/depgraph.py
===================================================================
--- pym/_emerge/depgraph.py	(revision 13715)
+++ pym/_emerge/depgraph.py	(working copy)
@@ -2446,11 +2446,12 @@
 				unresolved_blocks = False
 				depends_on_order = set()
 				for pkg in blocked_initial:
-					if pkg.slot_atom == parent.slot_atom:
-						# TODO: Support blocks within slots in cases where it
-						# might make sense.  For example, a new version might
-						# require that the old version be uninstalled at build
-						# time.
+					if pkg.cpv == parent.cpv:
+						#Note that we filter all blocks from a cpv on itself.
+						#Accorfing to pms this is ok, but it might make more 
+						#sense to block installed versions of this cpv.
+						#If you are going to fix it, you need to take care 
+						#of packages that block virtuals they provide.
 						continue
 					if parent.installed:
 						# Two currently installed packages conflict with