anchor.diff:        cp -r compilers_and_libraries_${version}/mac/compiler/lib/* $out/lib/
         cp -r compilers_and_libraries_${version}/mac/mkl/lib/* $out/lib/
         cp -r compilers_and_libraries_${version}/mac/tbb/lib/* $out/lib/
  +
  +      mkdir -p $out/lib/pkgconfig
  +      cp -r compilers_and_libraries_${version}/mac/mkl/bin/pkgconfig/* $out/lib/pkgconfig
     '' else ''
         mkdir -p $out/lib
   
  
positive.code:     platforms = [ "x86_64-linux" "x86_64-darwin" ];
      maintainers = [ maintainers.bhipple ];
    };
   } // stdenvNoCC.lib.optionalAttrs stdenvNoCC.isLinux {
    # Since on Linux binaries are unmodified, we can make them
    # fixed-output derivations.
  	outputHashAlgo = "sha256";
  	outputHashMode = "recursive";
  	outputHash = "101krzh2mjbfx8kvxim2zphdvgg7iijhbf9xdz3ad3ncgybxbdvw";
   })
  
negative.code:   For details on using mkl as a blas provider for python packages such as numpy,
    numexpr, scipy, etc., see the Python section of the NixPkgs manual.
  */
  stdenvNoCC.mkDerivation rec {
    name = "mkl-${version}";
    version = "${date}.${rel}";
    date = "2019.3";
  