anchor.diff:        --replace '-install_name $(libdir)' "-install_name $out/lib"
     '';
   
  -  configureFlags = [ "--zshcompletiondir=$(out)/share/zsh/site-functions" ];
  +  configureFlags = [ "--zshcompletiondir=${placeholder "out"}/share/zsh/site-functions" ];
   
     # Notmuch doesn't use autoconf and consequently doesn't tag --bindir and
     # friends
     setOutputFlags = false;
     enableParallelBuilding = true;
  -  makeFlags = "V=1";
  +  makeFlags = [ "V=1" ];
   
     preCheck = let
       test-database = fetchurl {
  
positive.code:     gdb man
    ];
  
    installTargets = "install install-man";
  
    dontGzipMan = true; # already compressed
  
  
negative.code: 
    src = fetchurl {
      url = "https://notmuchmail.org/releases/${name}.tar.gz";
      sha256 = "1jjnhs4xs4gksvg0a9qn68rxrj41im5bh58snka2pkj20nxwmcds";
    };
  
    nativeBuildInputs = [ pkgconfig ];
  