title: None of your spec sources contain a spec satisfying the dependency
body: <p>I am referencing the pod 'MatomoTracker' in my own pod
  I get this error while linting : with <code>pod lint spec</code></p>
  
  <pre><code> -&gt; TrackerPod.v3 (0.0.1)
      - ERROR | [iOS] unknown: Encountered an unknown error (CocoaPods could not find compatible versions for pod "Pods/MatomoTracker/MatomoTracker":
    In Podfile:
      TrackerPod.v3 (from `/Users/****/Documents/projects/ios/libs/TrackerPod.v3/TrackerPod.v3.podspec`) was resolved to 0.0.1, which depends on
        TrackerPod.v3/Matomo (= 0.0.1) was resolved to 0.0.1, which depends on
          Pods/MatomoTracker/MatomoTracker (= 5.2.0)
  
  None of your spec sources contain a spec satisfying the dependency: `Pods/MatomoTracker/MatomoTracker (= 5.2.0)`.
  
  You have either:
   * out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.
   * mistyped the name or version.
   * not added the source repo that hosts the Podspec to your Podfile.
  
  Note: as of CocoaPods 1.0, `pod repo update` does not happen on `pod install` by default.) during validation.
  
  Analyzed 1 podspec.
  
  [!] The spec did not pass validation, due to 1 error.
  </code></pre>
  
  <p>this is my <strong>podspec</strong>:</p>
  
  <pre><code>Pod::Spec.new do |spec|
  
    spec.name         = 'TrackerPod.v3'
    spec.version      = '0.0.1'
    spec.license      = 'Copyright ****'
    spec.homepage     = 'https://*******8/TrackerPod/blob/master/README.md'
    spec.author       = { '****' =&gt; '****@****.com' }
    spec.summary      = 'Some description'
    spec.source       = { :git =&gt; '****', :tag =&gt; spec.version.to_s }
    spec.source_files  = 'TrackerPod.v3/*.{h,m, swift}'
    spec.ios.deployment_target = '8.0'
    spec.osx.deployment_target = '10.10'
    spec.requires_arc = true
    spec.swift_version = '4.0'
    spec.xcconfig = { 'SWIFT_VERSION' =&gt; '4.1' }
    spec.dependency 'MatomoTracker', '5.2.0'
    spec.subspec 'Matomo' do |lib|
      lib.dependency 'Pods/MatomoTracker/MatomoTracker', '5.2.0'
      lib.source_files = 'Pods/MatomoTracker/MatomoTracker/**/*.{h,m,swift}'
    end
  end
  </code></pre>
  
  <p>and, this is <strong>a screenshot</strong> to show my project navigator.
  You can see that MatomoTracker is nested 2 levels downs inside 'Pods' </p>
  
  <p><a href="https://i.stack.imgur.com/EQofs.png" rel="nofollow noreferrer">the project navigator</a></p>
  
  <p>Am using the right path to reference MatomoTracker <code>Pods/MatomoTracker/MatomoTracker</code>, it does not seem to find the pod Matomoto ?
  Am I correct ?</p>