More likely this is from brew or macports. Xcode has shipped a newer version 
for a long time now.

> On Mar 17, 2016, at 10:21 AM, Swift Studies <swiftstud...@icloud.com> wrote:
> 
> 
> Ah that's good to know... I assume 1.8.4 is what is installed along with the 
> XCode command line tools.. What's the best way to upgrade the version without 
> upsetting XCode?
> 
> On Mar 17, 2016, at 04:50 PM, Max Howell <max.how...@apple.com> wrote:
> 
>>> I have a package I am building that I have introduced a dependency for, but 
>>> swift build is failing. It looks like a git error: 
>>> 
>>> gbn-sstudies-mv:SmarkDown sstudies$ swift build
>>> Cloning https://github.com/SwiftStudies/Duration.git
>>> /usr/local/bin/git -C 
>>> /Users/sstudies/Documents/Code/Swift/SPM/Packages/SmarkDown/Packages/Duration
>>>  fetch --tags origin
>>> Unknown option: -C
>>> usage: git [--version] [--help] [-c name=value]
>>>            [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
>>>            [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]
>>>            [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
>>>            <command> [<args>]
>>> 
>>> error: exit(129): git -C 
>>> /Users/sstudies/Documents/Code/Swift/SPM/Packages/SmarkDown/Packages/Duration
>>>  fetch --tags origin
>>> 
>>> Is it a git version issue? git --version reveals 1.8.4 which is being 
>>> picked up from /usr/local/bin/git
>>> 
>>> Please let me know if you need more information
>> 
>> We depend on at least git version 2, I’ll record a bug to report this error 
>> in these situations.
>> 
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