anchor.diff:    sysctl = singleBinary "sysctl" {
       linux = pkgs.procps;
       darwin = pkgs.darwin.system_cmds;
  +  };
  +  top = singleBinary "top" {
  +    linux = pkgs.procps;
  +    darwin = pkgs.darwin.top;
     };
     umount = singleBinary "umount" {
       linux = pkgs.utillinux;
  
positive.code: 
    procps = buildEnv {
      name = "procps-compat";
      paths = [ sysctl ps ];
    };
  
    utillinux = buildEnv {
      name = "utillinux-compat";
      paths = [ getopt hexdump script whereis write ];
    };
  
    nettools = buildEnv {
      name = "nettools-compat";
      paths = [ arp hostname netstat route ];
    };
  }
  
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;
  