diff -r 1ad6d6cee9eb -r 1969adf2139a mercurial/configitems.py
--- a/mercurial/configitems.py	Wed Jun 28 13:31:18 2017 +0200
+++ b/mercurial/configitems.py	Wed Jun 28 13:32:07 2017 +0200
@@ -71,6 +71,9 @@
 coreconfigitem('devel', 'disableloaddefaultcerts',
     default=False,
 )
+coreconfigitem('devel', 'servercafile',
+    default='',
+)
 coreconfigitem('patch', 'fuzz',
     default=2,
 )