Добавлена блокировка одновременного выполнения -1 и --keep-tree

pym/builder/variables/builder.py

@@ -1276,6 +1276,13 @@ class VariableClBuilderKeepTreeSet(Variable):
         self.help = _("keep portage tree in image")
         self.label = _("Keep portage tree")
 
+    def check(self, value):
+        if (not self.isTrue(value) and
+                self.GetBool('update.cl_update_onedepth_set')):
+            raise VariableError(
+                _("The removing portage tree is uncompatible with"
+                  " the clearing portage history"))
+
 
 class VariableClBuilderSquashExclude(ReadonlyVariable):
     """