# Pastebin nVBsgiZP
Here's my patched version of hmatrix-sundials
```
patched-hmatrix-sundials = pkgs.haskellPackages.hmatrix-sundials.overrideAttrs (oldAttrs: rec {
  src = pkgs.fetchgit {
    url = git://github.com/haskell-numerics/hmatrix;
    rev = "94c7f89929e09ca6e98976cb59dec574ee164e20";
    sha256 = "0mm7r81ajb38s0aqa2ywbc1c3zl4j4cffiy77iwmp5qaj53jz0d8";
  };
  postUnpack = ''
    sourceRoot=''${sourceRoot}/packages/gsl
    echo Source root reset to ''${sourceRoot}
  '';
});
```