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# From Mathieu's PR

# {ghc}:

# with import <nixpkgs> {};

# let
#   gfortranlibdir = "${gfortran7.cc.lib}";
#   # XXX Workaround https://ghc.haskell.org/trac/ghc/ticket/11042.
#   libHack = if stdenv.isDarwin then {

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{ nixpkgs ? import <nixpkgs>
  {}
, compiler ? "ghc822"
, doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

f = { mkDerivation, ad, base, c2hs, diagrams-lib, diagrams-rasterific, gcc

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#include "MyTypes.h"

void complex_add(Complex *a, Complex *b, Complex *c){
  c->re = a->re + b->re;
  c->im = a->im + b->im;
}

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bash-3.2$ nix-shell shell.nix -I nixpkgs=/Users/dom/nixpkgs
these derivations will be built:
  /nix/store/9701sn4vbjxgfrn6zgiky495fiyz8xsl-sundials-3.1.0.drv
building path(s) ‘/nix/store/1m9cicrvhwq27lb8f5hv0pgb3jx9wcs2-sundials-3.1.0’
unpacking sources
unpacking source archive /nix/store/z0rbcd9cjl5i8mdpk350wwswfgadqhv6-sundials-3.1.0.tar.gz
source root is nas-1.9.4
setting SOURCE_DATE_EPOCH to timestamp 1381168715 of file nas-1.9.4/HISTORY
patching sources
configuring

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sundials =
  let
  pname = "sundials"
  version = "3.1.0;
  in stdenv.mkDerivation {
  
  name = "${pname}-${version}";

  src = fetchurl {
  url = "https://computation.llnl.gov/projects/${pname}/download/${pname}-${version}.tar.gz";

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bash-3.2$ nix-shell shell.nix -I nixpkgs=/Users/dom/nixpkgs
warning: dumping very large path (> 256 MiB); this may run out of memory
these derivations will be built:
  /nix/store/0wakp1czwfiq8qls8gjdkd637y1siryh-gsl-2.6.drv
  /nix/store/af9q1010xar2db68sy2xbyrdzpmg6z80-hmatrix-gsl-0.18.0.1.drv
  /nix/store/ivjcp47c2c4gm7iyxyjkfrxgji0fpc2i-ghc-8.2.2-with-packages.drv
building path(s) ‘/nix/store/67srawwfsjp9gsf013fc2vaay6sq9gxp-gsl-2.6’
unpacking sources
unpacking source archive /nix/store/qvf0bz4864jy0f234fsk4wz1ldy29fix-gsl
source root is gsl

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 { nixpkgs ? import <nixpkgs>
  {}
  # { overlays = [(self: super: {gsl = super.gsl.overrideAttrs (o: {CFLAGS = "-DDEBUG";});})]; }
, compiler ? "ghc822"
, doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

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{ nixpkgs ? import <nixpkgs> { overlays = [(self: super: {gsl = super.gsl.overrideAttrs (o: {CFLAGS = "-DDEBUG";});})]; }
, compiler ? "ghc822"
, doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

f = { mkDerivation, ad, array, base, bytestring, cassava, containers
    , datasets, diagrams-lib, diagrams-rasterific, foldl, Frames, ghc-prim, gsl

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{ nixpkgs ? import <nixpkgs> { overlays = [(self: super: {gsl = super.gsl.overrideAttrs (o: {CFLAGS = "-DDEBUG";});})]; }
, compiler ? "ghc822"
, doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

f = { mkDerivation, ad, array, base, bytestring, cassava, containers
    , datasets, diagrams-lib, diagrams-rasterific, foldl, Frames, ghc-prim, gsl

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{ fetchurl, fetchpatch, stdenv }:

stdenv.mkDerivation rec {
  name = "gsl-2.4";

  src = fetchurl {
    url = "mirror://gnu/gsl/${name}.tar.gz";
    sha256 = "16yfs5n444s03np1naj6yp1fsysd42kdscxzkg0k2yvfjixx0ijd";
  };
  CFLAGS = "-DDEBUG";