anchor.diff:      "--localstatedir=/var"
     ] ++ lib.optionals withSystemd [ "--enable-systemd" ]
     ++ lib.optionals withUtempter [ "--enable-utempter" ]
  -  ++ lib.optionals stdenv.isDarwin [ "--enable-utf8proc" ];
  +  ++ lib.optionals withUtf8proc [ "--enable-utf8proc" ];
   
     enableParallelBuilding = true;
   
  
positive.code: , ncurses
  , pkg-config
  , withSystemd ? stdenv.isLinux && !stdenv.hostPlatform.isStatic, systemd
  , utf8proc
  , withUtempter ? stdenv.isLinux && !stdenv.hostPlatform.isMusl, libutempter
  }:
  
  
negative.code:     ncurses
      libevent
    ] ++ lib.optionals withSystemd [ systemd ]
    ++ lib.optionals withUtf8proc [ utf8proc ]
    ++ lib.optionals withUtempter [ libutempter ];
  
    configureFlags = [
  