anchor.diff:  ;;;;BUGS
   ;;;;LEGAL
   ;;;;    AGPL3
  -;;;;    
  +;;;;
   ;;;;    Copyright Pascal J. Bourguignon 2012 - 2016
  -;;;;    
  +;;;;
   ;;;;    This program is free software: you can redistribute it and/or modify
   ;;;;    it under the terms of the GNU Affero General Public License as published by
   ;;;;    the Free Software Foundation, either version 3 of the License, or
   ;;;;    (at your option) any later version.
  -;;;;    
  +;;;;
   ;;;;    This program is distributed in the hope that it will be useful,
   ;;;;    but WITHOUT ANY WARRANTY; without even the implied warranty of
   ;;;;    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   ;;;;    GNU Affero General Public License for more details.
  -;;;;    
  +;;;;
   ;;;;    You should have received a copy of the GNU Affero General Public License
   ;;;;    along with this program.  If not, see http://www.gnu.org/licenses/
   ;;;;**************************************************************************
  
positive.code: 
  (defun system-depends-on/recursive (system)
    (delete-duplicates
     (transitive-closure 
      (function system-depends-on)
      (list (string-downcase system)))
     :test 'string=))
  
negative.code:            "LISP-IMPLEMENTATION-TYPE-KEYWORD"
             "VERSION"
             "MACHINE-TYPE-KEYWORD"
             "DISTRIBUTION"
             "EXECUTABLE-NAME"
             "EXECUTABLE-FILENAME"
             "PRINT-MANIFEST"
  