freebsd stable - Jun 2015 - Sendmail problem after upgrade to r284296

> # DHParameters (only required if DSA/DH is used)
> O DHParameters=/etc/mail/certs/dh.param
> 
> # DHParameters (only required if DSA/DH is used)
> O DHParameters=/etc/mail/certs/dh.param
> 
> Again, default values, no changes to the installed files made.
Try recreating those -- I'm not exactly sure where they came from.

/etc/rc.d/sendmail stop
mv /etc/mail/certs/dh.param{,~old}
openssl dhparam -out /etc/mail/certs/dh.param 2048
/etc/rc.d/sendmail start
> root at Shop:/etc/mail/certs # openssl version
> OpenSSL 1.0.1n-freebsd 11 Jun 2015
1.0.1o has the ABI fix.  From openssl.org:

12-Jun-2015:	   New releases to resolve ABI compatibility problems:
12-Jun-2015:	   OpenSSL 1.0.2c is now available, including bug fixes
12-Jun-2015:	   OpenSSL 1.0.1o is now available, including bug fixes

It was imported on HEAD in rev 284329.

I updated source and rebuilt world and kernel with no change in sendmail's 
behavior.  This is the revision I have now:

root at Ace:/etc/mail/certs # svnlite info /usr/src/
Path: /usr/src
Working Copy Root Path: /usr/src
URL: svn://ace/src/stable/10
Relative URL: ^/stable/10
Repository Root: svn://ace/src
Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Revision: 284384
Node Kind: directory
Schedule: normal
Last Changed Author: kib
Last Changed Rev: 284375
Last Changed Date: 2015-06-14 01:12:48 -0400 (Sun, 14 Jun 2015)

root at Ace:/etc/mail/certs # uname -a
FreeBSD Ace.nina.org 10.1-STABLE FreeBSD 10.1-STABLE #0 r284384: Sun Jun 
14 16:40:15 EDT 2015     frank_s at Ace.nina.org:/usr/obj/usr/src/sys/GENERIC 
amd64

and openssl:

root at Ace:/etc/mail/certs # openssl version
OpenSSL 1.0.1o-freebsd 12 Jun 2015

so I'm up to date there as well.
> /etc/rc.d/sendmail stop
> mv /etc/mail/certs/dh.param{,~old}
> openssl dhparam -out /etc/mail/certs/dh.param 2048
> /etc/rc.d/sendmail start
After the update I got your email and followed your instructions, except 
for moving dh.param because it didn't exist, and sendmail is happy now.

I checked and there is still no mention of this in /usr/src/UPDATING so my 
question is, when and how is dh.param supposed to be created?  Since I'm 
not the only one with this problem it doesn't seem to be something I did 
or didn't do.  What could have caused dh.param to not be generated?

Thanks,
Frank