anchor.diff:  
     procps = buildEnv {
       name = "procps-compat";
  -    paths = [ sysctl ps ];
  +    paths = [ ps sysctl top ];
     };
   
     utillinux = buildEnv {
       name = "utillinux-compat";
  -    paths = [ getopt hexdump script whereis write ];
  +    paths = [ fsck fdisk getopt hexdump mount
  +              quota script umount whereis write ];
     };
   
     nettools = buildEnv {
       name = "nettools-compat";
  -    paths = [ arp hostname netstat route ];
  +    paths = [ arp hostname ifconfig netstat route ];
     };
   }
  
positive.code:     linux = pkgs.procps;
      darwin = pkgs.darwin.ps;
    };
    route = singleBinary "route" {
      linux = pkgs.nettools;
      darwin = pkgs.darwin.network_cmds;
  
negative.code:     linux = pkgs.utillinux;
      darwin = pkgs.getopt;
    };
    fdisk = singleBinary "fdisk" {
      linux = pkgs.utillinux;
      darwin = pkgs.darwin.diskdev_cmds;
    };
    fsck = singleBinary "fsck" {
      linux = pkgs.utillinux;
      darwin = pkgs.darwin.diskdev_cmds;
    };
    hexdump = singleBinary "hexdump" {
      linux = pkgs.utillinux;
      darwin = pkgs.darwin.shell_cmds;
  