```ruby
Pod::Spec.new do |s|
  s.name                  = "CreateSend"
  s.version               = "1.1.1"
  s.summary               = "An Objective-C library for talking to the Campaign Monitor API from Cocoa & Cocoa Touch applications."
  s.homepage              = "http://campaignmonitor.github.io/createsend-objectivec/"
  s.license               = { :type => "MIT", :file => "LICENSE" }
  s.authors               = { "Nathan de Vries" => "nathan@atnan.com", "Jonathan Younger" => "jonathan@daikini.com", "James Dennes" => "jdennes@gmail.com" }
  s.source                = { :git => "https://github.com/campaignmonitor/createsend-objectivec.git", :tag => "v1.1.1" }
  s.ios.deployment_target = "5.0"
  s.osx.deployment_target = "10.7"
  s.requires_arc          = true
  s.source_files          = "CreateSend", "Vendor/**/*.{h,m}"
  s.osx.exclude_files     = "CreateSend/*iOS.*", "CreateSend/CSAuthorizationViewController.*"
  s.prefix_header_file    = "CreateSend/CreateSend-Prefix.pch"
end
```

Use s.version to populate git tag in s.source.
user
```ruby
Pod::Spec.new do |s|
  s.name                  = "CreateSend"
  s.version               = "1.1.1"
  s.summary               = "An Objective-C library for talking to the Campaign Monitor API from Cocoa & Cocoa Touch applications."
  s.homepage              = "http://campaignmonitor.github.io/createsend-objectivec/"
  s.license               = { :type => "MIT", :file => "LICENSE" }
  s.authors               = { "Nathan de Vries" => "nathan@atnan.com", "Jonathan Younger" => "jonathan@daikini.com", "James Dennes" => "jdennes@gmail.com" }
  s.source                = { :git => "https://github.com/campaignmonitor/createsend-objectivec.git", :tag => "v#{s.version}" }
  s.ios.deployment_target = "5.0"
  s.osx.deployment_target = "10.7"
  s.requires_arc          = true
  s.source_files          = "CreateSend", "Vendor/**/*.{h,m}"
  s.osx.exclude_files     = "CreateSend/*iOS.*", "CreateSend/CSAuthorizationViewController.*"
  s.prefix_header_file    = "CreateSend/CreateSend-Prefix.pch"
end
```
assistant