Index: pym/portage/__init__.py
===================================================================
--- pym/portage/__init__.py	(revision 13840)
+++ pym/portage/__init__.py	(working copy)
@@ -5738,6 +5738,10 @@
 		mysettings["PORTAGE_LOG_FILE"] = os.path.join(
 			mysettings["T"], "build.log")
 
+	if 'unmerge-logs' not in mysettings.features and \
+		mysettings.get('EBUILD_PHASE') in ('postrm', 'prerm',):
+		mysettings.pop('PORTAGE_LOG_FILE', None)
+
 def _doebuild_exit_status_check(mydo, settings):
 	"""
 	Returns an error string if the shell appeared