$NetBSD: patch-mozilla_build_moz.configure_keyfiles.configure,v 1.1 2018/12/16 08:29:48 ryoon Exp $

--- mozilla/build/moz.configure/keyfiles.configure.orig	2017-04-14 04:53:01.000000000 +0000
+++ mozilla/build/moz.configure/keyfiles.configure
@@ -18,6 +18,7 @@ def keyfile(desc, help=None, callback=la
     @checking('for the %s key' % desc, lambda x: x and x is not no_key)
     @imports(_from='__builtin__', _import='open')
     @imports(_from='__builtin__', _import='IOError')
+    @imports(_from='os', _import='environ')
     def keyfile(value):
         if value:
             try:
@@ -28,7 +29,7 @@ def keyfile(desc, help=None, callback=la
                     raise FatalCheckError("'%s' is empty." % value[0])
             except IOError as e:
                 raise FatalCheckError("'%s': %s." % (value[0], e.strerror))
-        return no_key
+        return environ.get('MOZ_%s_KEY' % desc.upper().replace(' ', '_')) or no_key
 
     return keyfile