anchor.diff:      "--with-modules"
       #"--with-sysroot"
       "--without-gnutls"
  -    "--${boolWt (openssl_1-0-2 != null)}-openssl${
  -      boolString (openssl_1-0-2 != null) "=${openssl_1-0-2}" ""}"
  +    "--${boolWt (openssl != null)}-openssl${
  +      boolString (openssl != null) "=${openssl}" ""}"
       "--without-included-regex"
       "--with-libresolv"
       "--${boolWt (readline != null)}-readline${
  
positive.code:       boolString (expat != null) "=${expat}" ""}"
      # TODO
      #"--with-dnssec-local-validation"
      "--${boolWt (libidn != null)}-libidn"
    ];
  
    meta = with lib; {
  
negative.code: 
    buildInputs = [
      expat
      libidn2
      ncurses
      openssl
      readline
      zlib
    ];
  