anchor.diff:      buildInputs = [
         gau2grid
         libxc
  -      mkl
  +      blas
  +      lapack
         dkh_
         pcmsolver_
         libefp
  
positive.code:         --subst-var out
      '';
  
      doCheck = false;
      checkPhase = ''
        runHook preCheck
        ctest -j $NIX_BUILD_CORES
      '';
  
      doInstallCheck = true;
      installCheckPhase = ''
        export OMP_NUM_THREADS=2
  
negative.code:       rev = "v${version}";
        sha256 = "sha256-NVpE5fAVWYlkymTrvptZ7xqu68eVy71YJ+dRdBMMU9c=";
      };
  
      # Required for Libint compilation. g++ will otherwise not be able to link the large amount of files.
      preConfigure = ''
  