anchor.diff:      };
       armv7l-linux = {
         arch = "linuxarm";
  -      sha256 = "0k6wxwyg3pmbb5xdkwma0i3rvbjmy3p604g4minjjc1drzsn1i0q";
  +      sha256 = "0p0l1dzsygb6i1xxgbipjpxkn46xhq3jm41a34ga1qqp4x8lkr62";
         runtime = "armcl";
         kernel = "linuxarm";
       };
  
positive.code: { stdenv, fetchsvn, fetchpatch, gcc, glibc, m4, coreutils }:
  
  let
    options = rec {
      /* TODO: there are also MacOS, FreeBSD and Windows versions */
      x86_64-linux = {
        arch = "linuxx86";
        sha256 = "0g6mkl207ri3ib9w85i9w0sv7srz784pbxidz0d95p6qkvg6shba";
        runtime = "lx86cl64";
        kernel = "linuxx8664";
      };
  
negative.code: 
  stdenv.mkDerivation rec {
    name     = "ccl-${version}";
    version  = "1.11.5";
  
    src = fetchurl {
      url = "https://github.com/Clozure/ccl/releases/download/v${version}/ccl-${version}-${cfg.arch}.tar.gz";
      sha256 = cfg.sha256;
    };
  
    buildInputs = [ gcc glibc m4 ];
  