anchor.diff:  , lapack
   , libxml2
   , libxslt
  +, llvmPackages
   , pkg-config
  +, plfit
   , python3
   , sourceHighlight
   , suitesparse
  
positive.code:     sha256 = "sha256-SL9PcT18vFvykCv4VRXxXtlcDAcybmwEImnnKXMciFQ=";
    };
  
    # Normally, igraph wants us to call bootstrap.sh, which will call
    # tools/getversion.sh. Instead, we're going to put the version directly
    # where igraph wants, and then let autoreconfHook do the rest of the
    # bootstrap. ~ C.
    postPatch = ''
      echo "${version}" > IGRAPH_VERSION
    '' + lib.optionalString stdenv.isAarch64 ''
  
negative.code:     gmp
      lapack
      libxml2
      plfit
      suitesparse
    ] ++ lib.optionals stdenv.cc.isClang [
      llvmPackages.openmp
    ];
  
    cmakeFlags = [
  