anchor.diff:  
     fop = callPackage ../tools/typesetting/fop { };
   
  -  gist = callPackage ../tools/text/gist { };
  +  # Evaluation broken by recent ruby changes.
  +  # gist = callPackage ../tools/text/gist { };
   
     mcrl = callPackage ../tools/misc/mcrl { };
   
  
positive.code: 
    fsharp = callPackage ../development/compilers/fsharp {};
  
    gem-nix = callPackage ../tools/package-management/gem-nix { };
  
    go_1_0 = callPackage ../development/compilers/go { };
  
  
negative.code: 
    gifsicle = callPackage ../tools/graphics/gifsicle { };
  
    # Evaluation broken by recent ruby changes.
    # gitlab = callPackage ../applications/version-management/gitlab {
    #  libiconv = libiconvOrLibc;
    # };
  
    # Evaluation broken by recent ruby changes.
    # gitlab-shell = callPackage ../applications/version-management/gitlab-shell { };
  
    glusterfs = callPackage ../tools/filesystems/glusterfs { };
  
  