SYNCOID
-------
Syncoid depends on ssh, pv, gzip, lzop, and mbuffer.  It can run with reduced 
functionality in the absence of any or all of the above. SSH is only required
for remote synchronization.  On newer FreeBSD and Ubuntu Xenial 
chacha20-poly1305@openssh.com, on other distributions arcfour crypto is the 
default for SSH transport since v1.4.6. Syncoid runs will fail if one of them 
is not available on either end of the transport.

On Ubuntu: apt install pv lzop mbuffer
On FreeBSD: pkg install pv lzop

FreeBSD notes: mbuffer is not currently recommended due to oddities in 
               FreeBSD's local implementation.  Internal network buffering
               capability is on the roadmap soon to remove mbuffer dependency
               anyway.  FreeBSD places pv and lzop in /usr/local/bin instead
               of /usr/bin ; syncoid currently does not check path.

               Simplest path workaround is symlinks, eg:
               root@bsd:~# ln -s /usr/bin/lzop /usr/local/bin/lzop


SANOID
------
Sanoid depends on the Perl module Config::IniFiles and will not operate
without it.  Config::IniFiles may be installed from CPAN, though the project
strongly recommends using your distribution's repositories instead.

On Ubuntu: apt install libconfig-inifiles-perl
On FreeBSD: pkg install p5-Config-Inifiles