anchor.diff:  
       # Hack to remove impurities
       # TODO: We should fix this so we have a cached version of this module
  -    rm "$out"/lib/guile/2.0/ccache/srfi/srfi-4/gnu.go
  +    rm "$out"/lib/guile/2.2/ccache/srfi/srfi-4/gnu.go
     '';
   
     # A native Guile 2.0 is needed to cross-build Guile.
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "2.0.14";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprints = [
          "FF47 8FB2 64DE 32EC 2967  25A3 DDC0 F535 8812 F8F2"
          "3CE4 6455 8A84 FDC6 9DB4  0CFB 090B 1199 3D9A EBB5"
        ];
        inherit (src) outputHashAlgo;
        outputHash = "e8442566256e1be14e51fc18839cd799b966bc5b16c6a1d7a7c35155a8619d82";
      };
    };
  
  
negative.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "c18198ff6e8b05c620dbdd49b816a2e63a2688af843b5cf8e965041f1adcb515";
    };
  
    nativeBuildInputs = [
  