anchor.diff:  { stdenv, fetchurl, coreutils, utillinux,
     nettools, kbd, bc, which, gnused, gnugrep,
     groff, man-db, glibc, libiconv, pcre2,
  -  gettext, ncurses, python
  +  gettext, ncurses, python3
   
     , writeText
   
     , useOperatingSystemEtc ? true
  -  
  +
   }:
   
   with stdenv.lib;
  
positive.code:            "$out/share/fish/functions/__fish_print_help.fish"
      sed -i "s|/sbin /usr/sbin||" \
             "$out/share/fish/functions/__fish_complete_subcommand_root.fish"
      sed -e "s|clear;|${ncurses.out}/bin/clear;|" \
          -i "$out/share/fish/functions/fish_default_key_bindings.fish" \
  
    '' + optionalString stdenv.isLinux ''
      sed -e "s| ul| ${utillinux}/bin/ul|" \
  
negative.code:   # Python: Autocompletion generated from manpages and config editing
    propagatedBuildInputs = [
      coreutils gnugrep gnused bc
      python3 groff gettext
    ] ++ optional (!stdenv.isDarwin) man-db;
  
    postInstall = ''
  