--- a/hgext/evolve.py	Wed Nov 21 11:05:51 2012 +0100
+++ b/hgext/evolve.py	Wed Nov 21 11:14:20 2012 +0100
@@ -19,7 +19,7 @@
     - improves some aspect of the early implementation in 2.3
 '''
 
-testedwith = '2.4-rc'
+testedwith = '2.4'
 buglink = 'https://bitbucket.org/marmoute/mutable-history/issues'
 
 
@@ -33,7 +33,14 @@
     if not obsolete._enabled:
         obsolete._enabled = True
 except (ImportError, AttributeError):
-    raise util.Abort('Evolve extension requires Mercurial 2.4 (or later)')
+    raise util.Abort('Evolve extension requires Mercurial 2.4.x')
+try:
+    from mercurial import bookmarks
+    bookmarks.bmstore
+    raise util.Abort('This version of Evolve is too old for you mercurial version')
+except AttributeError:
+    pass
+
 
 
 from mercurial import bookmarks