spandsp: fix cross compilation

This commit adds `autoreconfHook` and cherry-picks a patch submitted
upstream in order to fix cross compilation.

- freeswitch/spandsp#47

pkgs/development/libraries/spandsp/3.nix

@@ -1,4 +1,6 @@
-{ lib, stdenv, fetchFromGitHub, audiofile, libtiff, autoreconfHook }:
+{ lib, stdenv, fetchFromGitHub, audiofile, libtiff, autoreconfHook
+, fetchpatch
+, buildPackages }:
 stdenv.mkDerivation rec {
   version = "3.0.0";
   pname = "spandsp";
@@ -9,11 +11,24 @@ stdenv.mkDerivation rec {
     sha256 = "03w0s99y3zibi5fnvn8lk92dggfgrr0mz5255745jfbz28b2d5y7";
   };
 
+  patches = [
+    # submitted upstream: https://github.com/freeswitch/spandsp/pull/47
+    (fetchpatch {
+      url = "https://github.com/freeswitch/spandsp/commit/1f810894804d3fa61ab3fc2f3feb0599145a3436.patch";
+      hash = "sha256-Cf8aaoriAvchh5cMb75yP2gsZbZaOLha/j5mq3xlkVA=";
+    })
+  ];
+
   outputs = [ "out" "dev" ];
 
   nativeBuildInputs = [ autoreconfHook ];
   propagatedBuildInputs = [ audiofile libtiff ];
 
+  makeFlags = [
+    "CC=${stdenv.cc.targetPrefix}cc"
+    "CC_FOR_BUILD=${buildPackages.stdenv.cc}/bin/cc"
+  ];
+
   meta = {
     description = "A portable and modular SIP User-Agent with audio and video support";
     homepage = "https://github.com/freeswitch/spandsp";

pkgs/development/libraries/spandsp/default.nix

@@ -1,7 +1,18 @@
-{ lib, stdenv, fetchurl, audiofile, libtiff, buildPackages }:
+{ lib, stdenv, fetchurl, audiofile, libtiff, buildPackages
+, fetchpatch
+, autoreconfHook }:
 stdenv.mkDerivation rec {
   version = "0.0.6";
   pname = "spandsp";
+
+  patches = [
+    # submitted upstream: https://github.com/freeswitch/spandsp/pull/47
+    (fetchpatch {
+      url = "https://github.com/freeswitch/spandsp/commit/1f810894804d3fa61ab3fc2f3feb0599145a3436.patch";
+      hash = "sha256-Cf8aaoriAvchh5cMb75yP2gsZbZaOLha/j5mq3xlkVA=";
+    })
+  ];
+
   src=fetchurl {
     url = "https://www.soft-switch.org/downloads/spandsp/spandsp-${version}.tar.gz";
     sha256 = "0rclrkyspzk575v8fslzjpgp4y2s4x7xk3r55ycvpi4agv33l1fc";
@@ -21,6 +32,7 @@ stdenv.mkDerivation rec {
   ];
 
   strictDeps = true;
+  nativeBuildInputs = [ autoreconfHook ];
   depsBuildBuild = [ buildPackages.stdenv.cc ];
   propagatedBuildInputs = [audiofile libtiff];
   meta = {