anchor.diff:      license = licenses.unfree;
       maintainers = with maintainers; [ prusnak ];
       platforms = platforms.unix;
  +    # Perl bindings fail on aarch64-darwin with "Undefined symbols for architecture arm64"
  +    broken = stdenv.isDarwin && stdenv.isAarch64;
     };
   }
  
positive.code: { lib, stdenv
  , fetchurl
  , gsl
  , mpfr
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "ViennaRNA";
    version = "2.4.18";
  
    src = fetchurl {
      url = "https://www.tbi.univie.ac.at/RNA/download/sourcecode/2_4_x/${pname}-${version}.tar.gz";
      sha256 = "17b0mcfkms0gn1a3faa4cakig65k9nk282x6mdh1mmjwbqzp5akw";
    };
  
    buildInputs = [
  