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I am storing a pre-compiled framework in Amazon s3. "pod spec lint" fails with following errors.

- ERROR | [iOS] file patterns: The `source_files` pattern did not match any file.
- ERROR | [iOS] file patterns: The `public_header_files` pattern did not match any file.
Running it with verbose option shows that it is downloading from s3, but instead of copying the downloaded framework, Cocoapod is copying the framework from '~//Library/Caches/CocoaPods/Pods/External/' directory. This turns out to be empty framework.  Because of this, "pod spec lint" fails with the above mentioned errors.
Here is the relevant part from "pod spec lint" output
  
Http download

  $ /usr/bin/curl -f -L -o
  /var/folders/qv/ld8pxb7d0_s1xn1mztqktj8h0000gn/T/d20160601-3868-fmxlyy/file.tgz
  https://s3.amazonaws.com/framework.ios.sdk/MyFramework.framework.1.0.tar.gz
  --create-dirs --netrc
 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                Dload  Upload   Total   Spent    Left   Speed   
    
100 67562  100 67562    0     0  74480      0 --:--:-- --:--:-- --:--:-- 74407
  
$ /usr/bin/tar xfz /var/folders/qv/ld8pxb7d0_s1xn1mztqktj8h0000gn/T/d20160601-3868-fmxlyy/file.tgz
  -C    /var/folders/qv/ld8pxb7d0_s1xn1mztqktj8h0000gn/T/d20160601-3868-fmxlyy
  Copying MyFramework from
  /Users/xxx/Library/Caches/CocoaPods/Pods/External/MyFramework/01a6da9f1381e3dbc8db63de5409d451-2eea2
  ../../../../private/var/folders/qv/ld8pxb7d0_s1xn1mztqktj8h0000gn/T/CocoaPods/Lint/Pods/MyFramework
  
Running pre install hooks
When I manually copied the framework to '~/Library/Caches/CocoaPods/Pods/External' directory validation goes through.
Here is the podspec file.
Pod::Spec.new do |s|
s.name             = 'MyFramework'
s.version          = '1.0'
s.summary          = 'MyFramework'
s.description      =  'MyFramework'
s.source           = { "http"=> "https://s3.amazonaws.com/framework.ios.sdk/MyFramework.1.0.tar.gz"}
# s.social_media_url = 'https://twitter.com/<TWITTER_USERNAME>'
s.platform     = :ios, "8.0"
s.source_files = 'MyFramework/Classes/**/*','MyFramework.framework/Headers/*.h'
s.ios.public_header_files =  'MyFramework.framework/Headers/*.h'
s.ios.vendored_frameworks = 'MyFramework.framework'
s.ios.frameworks = 'CoreGraphics', 'Foundation', 'MobileCoreServices', 'Security', 'SystemConfiguration', 'UIKit'
s.dependency 'AFNetworking', '~> 3.0'
s.dependency 'Mantle', '~>2.0.4'
s.dependency 'AWSCore'
s.dependency 'AWSS3'
Is there anything that I am missing in the podspec file.  Any help is greatly appreciated.
Thanks!
Your source_files property must contain project's source files, like
s.source_files = 'MyFramework/Classes/**/*.{h,m,c}'
And your public_header_files must refer to your headers in the project, not in the result framework, like
s.ios.public_header_files =  'MyFramework/Classes/PublicHeaders/*.h'
        
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