Pod GTMAppAuth and AppAuth together causes Archive issues: Multiple commands produce....

I have the following in my Podfile

target 'Claritist' do
  use_frameworks!
  # pod 'KMNavigationBarTransition'
  pod 'FontAwesome.swift'
  pod 'Eureka'
  pod 'PDTSimpleCalendar', '~> 0.9.1'
  pod 'SimpleImageViewer', :git => 'https://github.com/aFrogleap/SimpleImageViewer.git'
  pod 'SwiftDate'
  pod 'AFDateHelper'
  pod 'BadgeSwift', '~> 7.0'
  pod 'CallbackURLKit'
  pod 'GoogleAPIClientForREST/Gmail'
  pod 'GTMAppAuth'
  pod 'AppAuth'
  pod 'FTLinearActivityIndicator'
  pod 'Down'
  pod "MarkdownKit"
end

Build and run in simulator, everything is fine, until I try to do an "Archive", then I get the following error:

Multiple commands produce '/Users/supermonk/Library/Developer/Xcode/DerivedData/Claritist-hfetowswkdbjyygxvccgxsiufuhk/Build/Intermediates.noindex/ArchiveIntermediates/Claritist/IntermediateBuildFilesPath/UninstalledProducts/iphoneos/AppAuth.framework':
1) Target 'AppAuth-Core' has create directory command with output '/Users/supermonk/Library/Developer/Xcode/DerivedData/Claritist-hfetowswkdbjyygxvccgxsiufuhk/Build/Intermediates.noindex/ArchiveIntermediates/Claritist/IntermediateBuildFilesPath/UninstalledProducts/iphoneos/AppAuth.framework'
2) Target 'AppAuth' has create directory command with output '/Users/supermonk/Library/Developer/Xcode/DerivedData/Claritist-hfetowswkdbjyygxvccgxsiufuhk/Build/Intermediates.noindex/ArchiveIntermediates/Claritist/IntermediateBuildFilesPath/UninstalledProducts/iphoneos/AppAuth.framework'

The AppAuth-Core comes from GTMAppAuth, and I am not sure which library is the one I should be filing bug against!