anchor.diff:      sed -i 's|/usr/bin/env bash|${bash}/bin/bash|' duply
       mv duply "$out/bin"
       wrapProgram "$out/bin/duply" --set PATH \
  -        "${coreutils}/bin:${pythonEnv}/bin:${duplicity}/bin:${gawk}/bin:${gnupg1}/bin:${bash}/bin:${gnugrep}/bin:${txt2man}/bin:${which}/bin"
  +        "${coreutils}/bin:${python}/bin:${duplicity}/bin:${gawk}/bin:${gnupg1}/bin:${bash}/bin:${gnugrep}/bin:${txt2man}/bin:${which}/bin"
       "$out/bin/duply" txt2man | gzip -c > "$out/share/man/man1/duply.1.gz"
     '';
   
  
positive.code:   };
  
    buildInputs = [ txt2man makeWrapper ];
    propagatedBuildInputs = [ pythonEnv ];
    phases = [ "unpackPhase" "installPhase" ];
  
    installPhase = ''
  
negative.code: , gnugrep, txt2man, makeWrapper, which
  }:
  
  stdenv.mkDerivation {
    name = "duply-1.9.2";
  
    src = fetchurl {
  