anchor.diff:    configureFlags = [
       "--disable-maintainer-mode"
       "--${boolEn fixedPoint}-fixed-point"
  -    "--disable-fixed-point-debug"
       "--${boolEn (!fixedPoint)}-float-api"
       # non-Opus modes, e.g. 44.1 kHz & 2^n frames
       "--enable-custom-modes"
  -    # Requires IEEE 754 floating point
       "--enable-float-approx"
  -    "--enable-asm"
  -    "--enable-rtcd"
  -    # Enable intrinsics optimizations for ARM & X86
  -    "--${boolEn (
  -      (elem targetSystem platforms.arm-all)
  -      || (elem targetSystem platforms.x86-all))}-intrinsics"
  -    "--disable-assertions"
  -    "--disable-fuzzing"
  -    "--enable-ambisonics"
       "--disable-doc"
       "--disable-extra-programs"
  -    "--enable-update-draft"
  -    #--with-NE10
     ];
   
     passthru = {
  
positive.code:         outputHash
          outputHashAlgo
          urls;
        md5Urls = map (n: "${n}/MD5SUMS") releaseUrls;
        sha1Urls = map (n: "${n}/SHA1SUMS") releaseUrls;
        sha256Urls = map (n: "${n}/SHA256SUMS.txt") releaseUrls;
        failEarly = true;
      };
    };
  
  
negative.code: 
    sources = {
      "stable" = {
        version = "1.3";
        multihash = "QmZ26cTAXDkHJhj1ABJoUUUh1TN7SmzYQpuqenzTukAo9x";
        sha256 = "4f3d69aefdf2dbaf9825408e452a8a414ffc60494c70633560700398820dc550";
      };
      "head" = {
        fetchzipversion = 5;
  