anchor.diff:      "-DCMAKE_Fortran_FLAGS=-fPIC"
     ];
   
  +  doCheck = true;
  +
  +  checkPhase = "
  +    sed -i 's,^#!.*,#!${python}/bin/python,' lapack_testing.py
  +    ctest
  +  ";
  +
     enableParallelBuilding = true;
  +
  +  passthru = {
  +    blas = atlas;
  +  };
   
     meta = {
       description = "Linear Algebra PACKage";
  
positive.code: { stdenv, fetchurl, gfortran, atlas, cmake }:
  
  stdenv.mkDerivation {
    name = "liblapack-3.4.0";
  
negative.code: 
    propagatedBuildInputs = [ atlas ];
    buildInputs = [ gfortran cmake ];
    buildNativeInputs = [ python ];
  
    cmakeFlags = [
      "-DUSE_OPTIMIZED_BLAS=ON"
  