Please describe the problem.

The latest released version of git-annex (6.20161031) breaks on all platforms that do not have ssh 7.3 installed as it relies on "Include" ssh_config(5) configuration flag that appeared in 7.3p1. The broken platforms include macOS Sierra and Ubuntu 16.04 Xenial (LTS) both include ssh 7.2

# Ubuntu 16.04
$ ssh -V
OpenSSH_7.2p2 Ubuntu-4ubuntu2.1, OpenSSL 1.0.2g  1 Mar 2016

# macOS
$ ssh -V
OpenSSH_7.2p2, LibreSSL 2.4.1

Here is what it looks like:

$ git annex move --to vir
move Foobar.mkv (checking vir...) .git/annex/ssh.config: line 1: Bad configuration option: include
.git/annex/ssh.config: line 2: Bad configuration option: include
.git/annex/ssh.config: terminating, 2 bad configuration options
(unable to check vir
CallStack (from HasCallStack):
  error, called at ./Remote/Helper/Messages.hs:32:15 in main:Remote.Helper.Messages) failed


$ cat .git/annex/ssh.config
Include ~/.ssh/config
Include /etc/ssh/ssh_config
ServerAliveInterval 60

This is already fixed in git. done --Joey