anchor.diff:      (fetchpatch {
         url = "https://github.com/fmtlib/fmt/commit/78f041ab5b40a1145ba686aeb8013e8788b08cd2.patch";
         sha256 = "hjE6Q/ubA4UhvuJXgcsA3wiGoDK031P19njQRL9JF8M=";
  +    })
  +
  +    # Fix cmake config paths.
  +    (fetchpatch {
  +      url = "https://github.com/fmtlib/fmt/pull/1702.patch";
  +      sha256 = "18cadqi7nac37ymaz3ykxjqs46rvki396g6qkqwp4k00cmic23y3";
       })
     ];
   
  
positive.code:     owner = "fmtlib";
      repo = "fmt";
      rev = version;
      sha256 = "1vr08a8q94j66gas7ddbpdbq72b2ikd0mkgd5zd3l63610n8qajs";
    };
  
    patches = [
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "fmt";
    version = "6.2.1";
  
    outputs = [ "out" "dev" ];
  
  