anchor.diff:    # https://github.com/aristidb/aws/issues/275
     aws = overrideCabal (drv: {
       patches = drv.patches or [] ++ [
  -      (pkgs.fetchpatch {
  +      (fetchpatch {
           name = "aws-aeson-2.0-compat.patch";
           url = "https://github.com/aristidb/aws/pull/277/commits/7af7586c5d244d07f77d49e5fdc739e6e8e54816.patch";
           sha256 = "1bsiyk1k671rwlyflka2whq972h72cwscrxkr9n2wzhxp70ap3g3";
  
positive.code:   # * Fix build failure by picking patch from 8.5, we need
    #   this version of sbv for petrinizer
    # * Pin version of crackNum that still exposes its library
    sbv_7_13 = appendPatch (pkgs.fetchpatch {
        url = "https://github.com/LeventErkok/sbv/commit/57014b9c7c67dd9b63619a996e2c66e32c33c958.patch";
        sha256 = "10npa8nh2413n6p6qld795qfkbld08icm02bspmk93y0kabpgmgm";
      })
  
negative.code:     version = "1.0";
      sha256 = "0xl848q8z6qx2bi6xil0d35lra7wshwvysyfblki659d7272b1im";
      description = "GHC BigNum library";
      license = lib.licenses.bsd3;
      # ghc-bignum is not buildable if none of the three backends
      # is explicitly enabled. We enable Native for now as it doesn't
      # depend on anything else as oppossed to GMP and FFI.
  