Updated the podspec so the GIF+FLAnimatedImage is a separate subspec

SDWebImage.podspec

@@ -35,6 +35,16 @@ Pod::Spec.new do |s|
     mk.dependency 'SDWebImage/Core'
   end
 
+  s.subspec 'GIF' do |gif|
+    gif.ios.deployment_target = '6.0'
+    gif.source_files = 'SDWebImage/FLAnimatedImage/*.{h,m}'
+    gif.dependency 'SDWebImage/Core'
+    gif.dependency 'FLAnimatedImage', '~> 1.0'
+    gif.xcconfig = {
+      'USER_HEADER_SEARCH_PATHS' => '$(inherited) $(SRCROOT)/FLAnimatedImage/FLAnimatedImage'
+    }
+  end
+
   s.subspec 'WebP' do |webp|
     webp.source_files = 'SDWebImage/UIImage+WebP.{h,m}'
     webp.xcconfig = {