```ruby
Pod::Spec.new do |s|

  s.name         = "MPMessagePack"
  s.version      = "1.3.8"
  s.summary      = "Library for MessagePack"
  s.homepage     = "https://github.com/gabriel/MPMessagePack"
  s.license      = { :type => "MIT" }
  s.author       = { "Gabriel Handford" => "gabrielh@gmail.com" }
  s.source       = { :git => "https://github.com/gabriel/MPMessagePack.git", :tag => s.version.to_s }
  s.requires_arc = true

  s.dependency "GHODictionary"

  s.platform = :ios, "6.0"
  s.ios.deployment_target = "6.0"
  s.ios.source_files = "MPMessagePack/**/*.{c,h,m}", "RPC/**/*.{c,h,m}"

  s.platform = :osx, "10.8"
  s.osx.deployment_target = "10.8"
  s.osx.source_files = "MPMessagePack/**/*.{c,h,m}", "RPC/**/*.{c,h,m}", "XPC/**/*.{c,h,m}"

end
```

Remove `platform` attributes in lieu of `deployment_target`
user
```ruby
Pod::Spec.new do |s|

  s.name         = "MPMessagePack"
  s.version      = "1.3.8"
  s.summary      = "Library for MessagePack"
  s.homepage     = "https://github.com/gabriel/MPMessagePack"
  s.license      = { :type => "MIT" }
  s.author       = { "Gabriel Handford" => "gabrielh@gmail.com" }
  s.source       = { :git => "https://github.com/gabriel/MPMessagePack.git", :tag => s.version.to_s }
  s.requires_arc = true

  s.dependency "GHODictionary"

  s.ios.deployment_target = "6.0"
  s.ios.source_files = "MPMessagePack/**/*.{c,h,m}", "RPC/**/*.{c,h,m}"

  s.osx.deployment_target = "10.8"
  s.osx.source_files = "MPMessagePack/**/*.{c,h,m}", "RPC/**/*.{c,h,m}", "XPC/**/*.{c,h,m}"

end
```
assistant