anchor.diff:      gmp
       lapack
       libxml2
  +    plfit
       suitesparse
  +  ] ++ lib.optionals stdenv.cc.isClang [
  +    llvmPackages.openmp
     ];
   
     cmakeFlags = [
  
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: , lapack
  , libxml2
  , libxslt
  , llvmPackages
  , pkg-config
  , plfit
  , python3
  , sourceHighlight
  , suitesparse
  