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