anchor.diff:  
     appdaemon = callPackage ../servers/home-assistant/appdaemon.nix { };
   
  -  archiveopteryx = callPackage ../servers/mail/archiveopteryx/default.nix { };
  +  archiveopteryx = callPackage ../servers/mail/archiveopteryx { };
   
     atlassian-confluence = callPackage ../servers/atlassian/confluence.nix { };
     atlassian-crowd = callPackage ../servers/atlassian/crowd.nix { };
  
positive.code: 
    xbindkeys = callPackage ../tools/X11/xbindkeys { };
  
    xbindkeys-config = callPackage ../tools/X11/xbindkeys-config/default.nix {
      gtk = gtk2;
    };
  
  
negative.code: 
    picosat = callPackage ../applications/science/logic/picosat {};
  
    libpoly = callPackage ../applications/science/logic/poly {};
  
    prooftree = (with ocamlPackages_4_01_0;
      callPackage  ../applications/science/logic/prooftree {
  