anchor.diff:    inherit (callPackages ../data/fonts/tai-languages { }) tai-ahom;
   
     tango-icon-theme = callPackage ../data/icons/tango-icon-theme {
  -    gtk = gtk2;
  +    gtk = res.gtk2;
     };
   
     themes = name: callPackage (../data/misc/themes + ("/" + name + ".nix")) {};
  
positive.code:   valgrind = callPackage ../development/tools/analysis/valgrind {
      inherit (buildPackages.darwin) xnu bootstrap_cmds cctools;
    };
    valgrind-light = valgrind.override { gdb = null; };
  
    valkyrie = callPackage ../development/tools/analysis/valkyrie { };
  
  
negative.code:   };
  
    pcre = callPackage ../development/libraries/pcre { };
    pcre16 = res.pcre.override { variant = "pcre16"; };
    # pcre32 seems unused
    pcre-cpp = res.pcre.override { variant = "cpp"; };
  
    pcre2 = callPackage ../development/libraries/pcre2 { };
  
  