On Oct 3, 2016, at 11:11 PM, Eli Zaretskii <eliz@gnu.org> wrote:

>> From: Dave Abrahams <dave@boostpro.com>
>> Date: Mon, 03 Oct 2016 12:50:48 -0700
>> 
>> 
>> Look at the following two strings.  The first should appear as a
>> rainbow-striped flag and the second as Cuban flag.  In Emacs built for
>> MacOS, they display as strings of blank space.
>> 
>> "🏳️‍🌈"
>> "🇨🇺"
> 
> Do you have fonts installed that support these codepoints?

Yes.  Yamamoto Mitsuharu's "emacs mac port" displays them properly on my machine. 

> 
> The default fontset arranges for these characters to be displayed by
> the Symbola font -- do you have that installed?

I am AFK at the moment, but I think I do not have that font. 

Sent from my moss-covered three-handled family gradunza