diff -r b1cf9bb8a5a2 -r 1ad6d6cee9eb mercurial/configitems.py
--- a/mercurial/configitems.py	Wed Jun 28 13:31:05 2017 +0200
+++ b/mercurial/configitems.py	Wed Jun 28 13:31:18 2017 +0200
@@ -68,6 +68,9 @@
 coreconfigitem('devel', 'check-relroot',
     default=False,
 )
+coreconfigitem('devel', 'disableloaddefaultcerts',
+    default=False,
+)
 coreconfigitem('patch', 'fuzz',
     default=2,
 )