On Wed, Jul 05, 2017 at 12:21:04AM +0200, Joshua Sierles wrote:
> 
> This package fails running tests due to a syntax error reported by perl
> scripts used in the tests. I haven't dug into the problem yet - just
> wanted to report it. I've attached the test suite log from the failed
> build. here's the error:
> 
> Unescaped left brace in regex is illegal here in regex; marked by <--
> HERE in m/{{ <-- HERE port}}/ at FTPServer.pm line 592.

Can you try adapting the fix used for intltool (commit
92cb946bd9d78cb8f6aa8418d505f52da6894ab4), or checking if the
tmux maintainers have applied a similar fix?