anchor.diff:      substituteInPlace src/nco/nco_fl_utl.c \
         --replace "/bin/mv" "${coreutils}/bin/mv"
     '';
  -  
  +
     meta = {
       description = "NetCDF Operator toolkit";
       longDescription = "The NCO (netCDF Operator) toolkit manipulates and analyzes data stored in netCDF-accessible formats, including DAP, HDF4, and HDF5";
  
positive.code: 
    src = fetchzip {
      url = "https://github.com/nco/nco/archive/${version}.tar.gz";
      sha256 = "0jpv2hw2as5wh06ac4hkhy7964w81pm7kp6nbwhmiyfzjzhwqhjy";
    };
  
    prePatch = ''
  
negative.code: { stdenv, fetchzip, netcdf, netcdfcxx4, gsl, udunits, antlr, which, curl, flex, coreutils }:
  
  stdenv.mkDerivation rec {
    version = "4.9.5";
    pname = "nco";
  
    nativeBuildInputs = [ flex which ];
  