--- a/hgext/obsolete.py	Thu Mar 19 13:41:58 2015 -0700
+++ b/hgext/obsolete.py	Thu Mar 19 13:42:27 2015 -0700
@@ -14,8 +14,6 @@
 
 try:
     from mercurial import obsolete
-    if not obsolete._enabled:
-        obsolete._enabled = True
 except ImportError:
     raise util.Abort('Obsolete extension requires Mercurial 2.3 (or later)')
 
@@ -40,6 +38,10 @@
     """
     if not repo.local():
         return
+    evolveopts = ui.configlist('experimental', 'evolution')
+    if not evolveopts:
+        evolveopts = 'all'
+        ui.setconfig('experimental', 'evolution', evolveopts)
     for arg in sys.argv:
         if 'debugc' in arg:
             break