Cannot compile AudioKit 4.2.2 - ios

Question

I've just downloaded AudioKit most recent version (4.2.2). When I ran the build_frameworks.sh I get the following error:
[AVAudioUnit?]' has no member 'compactMap'
return _effectsChain.compactMap { $0 }
^~~~~~~~~~~~~ ~~~~~~~~~~
/Users/sky/Desktop/AudioKit-4.2.2/AudioKit/Common/Nodes/Mixing/Mixer/AKMixer.swift:40:19: error: value of type '[AKNode?]' has no member 'compactMap'
self.init(inputs.compactMap { $0 })
^~~~~~ ~~~~~~~~~~
/Users/sky/Desktop/AudioKit-4.2.2/AudioKit/Common/Internals/AudioKitHelpers.swift:22:16: error: cannot invoke 'index' with an argument list of type '(Self.Index, offsetBy: Int)'
return index(startIndex, offsetBy: offset)
^
/Users/sky/Desktop/AudioKit-4.2.2/AudioKit/Common/Internals/AudioKitHelpers.swift:22:16: note: expected an argument list of type '(Self.Index, offsetBy: Self.IndexDistance)'
return index(startIndex, offsetBy: offset)
^
/Users/sky/Desktop/AudioKit-4.2.2/AudioKit/Common/Internals/CoreAudio/AudioUnit+Helpers.swift:101:29: error: missing argument for parameter 'capacity' in call
data.deallocate()
^
capacity: <#Int#>
Swift.UnsafeMutablePointer:273:17: note: 'deallocate(capacity:)' declared here
public func deallocate(capacity: Int)
^
/Users/sky/Desktop/AudioKit-4.2.2/AudioKit/Common/Nodes/Effects/Reverb/Convolution/AKConvolution.swift:144:41: error: missing argument for parameter 'capacity' in call
theData?.deallocate()
^
capacity: <#Int#>
Swift.UnsafeMutablePointer:273:17: note: 'deallocate(capacity:)' declared here
public func deallocate(capacity: Int)
^
/Users/sky/Desktop/AudioKit-4.2.2/AudioKit/Common/Nodes/Playback/Phase-Locked Vocoder/AKPhaseLockedVocoder.swift:226:41: error: missing argument for parameter 'capacity' in call
theData?.deallocate()
^
capacity: <#Int#>
Swift.UnsafeMutablePointer:273:17: note: 'deallocate(capacity:)' declared here
public func deallocate(capacity: Int)
^
/Users/sky/Desktop/AudioKit-4.2.2/AudioKit/Common/Nodes/Effects/AudioKit Operation-Based Effect/AKOperationEffect.swift:28:17: error: value of type '[NSNumber]' has no member 'compactMap'
$0.compactMap { $0.doubleValue }
^~ ~~~~~~~~~~
I tried to copy the AudioKit source code into the project I was testing: AudioKit's HelloWorld project. In this case I have the following error on XCode:
/Users/sky/Desktop/AudioKit-4.2.2/AudioKit/Common/Internals/AudioUnit Host/AKAudioUnitManager.swift:140:16: Value of type '[AVAudioUnit?]' has no member 'compactMap'
The error is thrown on source code file AKAudioUnitManager.swift on the method below:
private var linkedEffects: [AVAudioUnit] {
return _effectsChain.compactMap { $0 }
}
Also, playground is not working even with compiled framework.
I use MacOS Sierra, XCode 9.2, Swift 4, iOS 9.2.
Thanks!