anchor.diff:      "-DNACL_INCLUDE_DIR=${libsodium}/include"
     ];
   
  +  passthru = {
  +    srcVerification = fetchurl {
  +      failEarly = true;
  +      pgpDecompress = true;
  +      pgpsigUrl = "https://red.libssh.org/attachments/download/209/libssh-0.7.4.tar.asc";
  +      pgpKeyFingerprint = "8DFF 53E1 8F2A BC8D 8F3C  9223 7EE0 FC4D CC01 4E3D";
  +      inherit (src) urls outputHash outputHashAlgo;
  +    };
  +  };
  +
     meta = with stdenv.lib; {
       description = "SSH client library";
       license = licenses.lgpl2Plus;
  
positive.code: , kerberos
  , libsodium
  , zlib
  , openssl
  }:
  
  stdenv.mkDerivation rec {
    name = "libssh-0.7.3";
  
    src = fetchurl {
      url = "https://red.libssh.org/attachments/download/195/libssh-0.7.3.tar.xz";
      multihash = "QmUVD9ayYoqbjcoQax3KGHtsB3yXoinJBPSZC2gE4vMWAn";
      sha256 = "165g49i4kmm3bfsjm0n8hm21kadv79g9yjqyq09138jxanz4dvr6";
    };
  
    nativeBuildInputs = [
  
negative.code:   buildInputs = [
      kerberos
      libsodium
      openssl_1-0-2
      zlib
    ];
  
  