diff --git a/PromiseKit.podspec b/PromiseKit.podspec
new file mode 100644
index 000000000..3badbf674
--- /dev/null
+++ b/PromiseKit.podspec
@@ -0,0 +1,261 @@
+Pod::Spec.new do |s|
+  s.name = "PromiseKit"
+
+  `xcodebuild -project PromiseKit.xcodeproj -showBuildSettings` =~ /CURRENT_PROJECT_VERSION = ((\d\.)+\d)/
+  abort("No version detected") if $1.nil?
+  s.version = $1
+
+  s.source = {
+    :git => "https://github.com/mxcl/#{s.name}.git",
+    :tag => s.version,
+    :submodules => true
+  }
+
+  s.license = 'MIT'
+  s.summary = 'Promises for Swift & ObjC.'
+  s.homepage = 'http://promisekit.org'
+  s.description = 'A thoughtful and complete implementation of promises for iOS, macOS, watchOS and tvOS with first-class support for both Objective-C and Swift.'
+  s.social_media_url = 'https://twitter.com/mxcl'
+  s.authors  = { 'Max Howell' => 'mxcl@me.com' }
+  s.documentation_url = 'http://promisekit.org/docs/'
+  s.default_subspecs = 'CorePromise', 'UIKit', 'Foundation'
+  s.requires_arc = true
+  s.swift_version = '4.0'
+
+  # CocoaPods requires us to specify the root deployment targets
+  # even though for us it is nonsense. Our root spec has no
+  # sources.
+  s.ios.deployment_target = '8.0'
+  s.osx.deployment_target = '10.10'
+  s.watchos.deployment_target = '2.0'
+  s.tvos.deployment_target = '9.0'
+  
+  s.pod_target_xcconfig = {
+    'OTHER_SWIFT_FLAGS' => '-DPMKCocoaPods',
+  }
+
+  s.subspec 'Accounts' do |ss|
+    ss.ios.source_files = ss.osx.source_files = 'Extensions/Accounts/Sources/*'
+    ss.ios.frameworks = ss.osx.frameworks = 'Accounts'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+  end
+
+  s.subspec 'Alamofire' do |ss|
+    ss.source_files = 'Extensions/Alamofire/Sources/*'
+    ss.dependency 'Alamofire', '~> 4.0'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.11'
+    ss.watchos.deployment_target = '2.0'
+    ss.tvos.deployment_target = '9.0'
+  end
+
+  s.subspec 'AddressBook' do |ss|
+    ss.ios.source_files = 'Extensions/AddressBook/Sources/*'
+    ss.ios.frameworks = 'AddressBook'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+  end
+
+  s.subspec 'AssetsLibrary' do |ss|
+    ss.ios.source_files = 'Extensions/AssetsLibrary/Sources/*'
+    ss.ios.frameworks = 'AssetsLibrary'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+  end
+
+  s.subspec 'AVFoundation' do |ss|
+    ss.ios.source_files = 'Extensions/AVFoundation/Sources/*'
+    ss.ios.frameworks = 'AVFoundation'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+  end
+
+  s.subspec 'Bolts' do |ss|
+    ss.source_files = 'Extensions/Bolts/Sources/*'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.dependency 'Bolts', '~> 1.9.0'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.watchos.deployment_target = '2.0'
+    ss.tvos.deployment_target = '9.0'
+  end
+
+  s.subspec 'CloudKit' do |ss|
+    ss.source_files = 'Extensions/CloudKit/Sources/*'
+    ss.frameworks = 'CloudKit'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '10.0'
+    ss.osx.deployment_target = '10.12'
+    ss.tvos.deployment_target = '10.0'
+    ss.watchos.deployment_target = '3.0'
+  end
+
+  s.subspec 'CoreBluetooth' do |ss|
+    ss.ios.source_files = ss.osx.source_files = ss.tvos.source_files = 'Extensions/CoreBluetooth/Sources/*'
+    ss.ios.frameworks = ss.osx.frameworks = ss.tvos.frameworks = 'CoreBluetooth'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.tvos.deployment_target = '9.0'
+  end
+
+  s.subspec 'CorePromise' do |ss|
+    hh = Dir['Sources/*.h'] - Dir['Sources/*+Private.h']
+
+    cc = Dir['Sources/*.swift'] - ['Sources/SwiftPM.swift']
+    cc << 'Sources/{after,AnyPromise,GlobalState,dispatch_promise,hang,join,PMKPromise,when,race}.m'
+    cc += hh
+    
+    ss.source_files = cc
+    ss.public_header_files = hh
+    ss.preserve_paths = 'Sources/AnyPromise+Private.h', 'Sources/PMKCallVariadicBlock.m', 'Sources/NSMethodSignatureForBlock.m'
+    ss.frameworks = 'Foundation'
+    
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.watchos.deployment_target = '2.0'
+    ss.tvos.deployment_target = '9.0'
+  end
+
+  s.subspec 'CoreLocation' do |ss|
+    ss.source_files = 'Extensions/CoreLocation/Sources/*'
+    ss.watchos.source_files = 'Extensions/CoreLocation/Sources/CLGeocoder*'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.frameworks = 'CoreLocation'
+
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.watchos.deployment_target = '3.0'
+    ss.tvos.deployment_target = '9.0'
+  end
+
+  s.subspec 'EventKit' do |ss|
+    ss.ios.source_files = ss.osx.source_files = ss.watchos.source_files = 'Extensions/EventKit/Sources/*'
+    ss.ios.frameworks = ss.osx.frameworks = ss.watchos.frameworks = 'EventKit'
+    ss.dependency 'PromiseKit/CorePromise'
+
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.watchos.deployment_target = '2.0'
+  end
+  
+  s.subspec 'Foundation' do |ss|
+    ss.source_files = Dir['Extensions/Foundation/Sources/*']
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.frameworks = 'Foundation'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.watchos.deployment_target = '2.0'
+    ss.tvos.deployment_target = '9.0'
+  end
+    
+  s.subspec 'MapKit' do |ss|
+    ss.ios.source_files = ss.osx.source_files = ss.tvos.source_files = 'Extensions/MapKit/Sources/*'
+    ss.ios.frameworks = ss.osx.frameworks = ss.tvos.frameworks = 'MapKit'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.watchos.deployment_target = '2.0'
+    ss.tvos.deployment_target = '9.2'
+  end
+
+  s.subspec 'MessageUI' do |ss|
+    ss.ios.source_files = 'Extensions/MessagesUI/Sources/*'
+    ss.ios.frameworks = 'MessageUI'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+  end
+
+  s.subspec 'OMGHTTPURLRQ' do |ss|
+    ss.source_files = 'Extensions/OMGHTTPURLRQ/Sources/*'
+    ss.dependency 'PromiseKit/Foundation'
+    ss.dependency 'OMGHTTPURLRQ', '~> 3.2'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.watchos.deployment_target = '2.0'
+    ss.tvos.deployment_target = '9.0'
+  end
+
+  s.subspec 'Photos' do |ss|
+    ss.ios.source_files = ss.tvos.source_files = ss.osx.source_files = 'Extensions/Photos/Sources/*'
+    ss.ios.frameworks = ss.tvos.frameworks = ss.osx.frameworks = 'Photos'
+    ss.dependency 'PromiseKit/CorePromise'
+    
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.13'
+    ss.tvos.deployment_target = '10.0'
+  end
+
+  s.subspec 'QuartzCore' do |ss|
+    ss.osx.source_files = ss.ios.source_files = ss.tvos.source_files = 'Extensions/QuartzCore/Sources/*'
+    ss.osx.frameworks = ss.ios.frameworks = ss.tvos.frameworks = 'QuartzCore'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.tvos.deployment_target = '9.0'
+  end
+
+  s.subspec 'Social' do |ss|
+    ss.ios.source_files = 'Extensions/Social/Sources/*'
+    ss.osx.source_files = Dir['Extensions/Social/Sources/*'] - ['Categories/Social/Sources/*SLComposeViewController+Promise.swift']
+    ss.ios.frameworks = ss.osx.frameworks = 'Social'
+    ss.dependency 'PromiseKit/Foundation'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+  end
+
+  s.subspec 'StoreKit' do |ss|
+    ss.ios.source_files = ss.osx.source_files = ss.tvos.source_files = 'Extensions/StoreKit/Sources/*'
+    ss.ios.frameworks = ss.osx.frameworks = ss.tvos.frameworks = 'StoreKit'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.tvos.deployment_target = '9.0'
+  end
+
+  s.subspec 'SystemConfiguration' do |ss|
+    ss.ios.source_files = ss.osx.source_files = ss.tvos.source_files = 'Extensions/SystemConfiguration/Sources/*'
+    ss.ios.frameworks = ss.osx.frameworks = ss.tvos.frameworks = 'SystemConfiguration'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+    ss.osx.deployment_target = '10.10'
+    ss.tvos.deployment_target = '9.0'
+  end
+
+  picker_cc = 'Extensions/UIKit/Sources/UIImagePickerController+Promise.swift'
+  
+  s.subspec 'UIKit' do |ss|
+    ss.ios.source_files = ss.tvos.source_files = Dir['Extensions/UIKit/Sources/*'] - [picker_cc]
+    ss.tvos.frameworks = ss.ios.frameworks = 'UIKit'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+    ss.tvos.deployment_target = '9.0'
+  end
+
+  s.subspec 'UIImagePickerController' do |ss|
+    # Since iOS 10, App Store submissions that contain references to
+    # UIImagePickerController (even if unused in 3rd party libraries)
+    # are rejected unless an Info.plist key is specified, thus we
+    # moved this code to a sub-subspec.
+    #
+    # This *was* a subspec of UIKit, but bizarrely CocoaPods would
+    # include this when specifying *just* UIKit…!
+
+    ss.ios.source_files = picker_cc
+    ss.ios.frameworks = 'UIKit'
+    ss.ios.xcconfig = { "GCC_PREPROCESSOR_DEFINITIONS" => '$(inherited) PMKImagePickerController=1' }
+    ss.dependency 'PromiseKit/UIKit'
+    ss.ios.deployment_target = '8.0'
+  end
+
+  s.subspec 'WatchConnectivity' do |ss|
+    ss.ios.source_files = ss.watchos.source_files = 'Extensions/WatchConnectivity/Sources/*'
+    ss.ios.frameworks = ss.watchos.frameworks = 'WatchConnectivity'
+    ss.dependency 'PromiseKit/CorePromise'
+    ss.ios.deployment_target = '8.0'
+    ss.watchos.deployment_target = '2.0'
+  end
+end