Thank you for using Astroid Framework. We will sure add requested feature in our next version.
For Now, Please download the constants.php file (from here) and replace with existing one (at YOUR_JOOMLA_DIRECTORY/libraries/astroid/framework/constants.php) and after that you will be able to add your Flickr account.
Don't worry about future updates, We already added Flickr and more for Astroid's upcoming version.
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