givaro: unbreak on darwin

pkgs/by-name/gi/givaro/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch2,
   automake,
   autoconf,
   libtool,
@@ -22,6 +23,11 @@ stdenv.mkDerivation rec {
   patches = [
     # skip gmp version check for cross-compiling, our version is new enough
     ./skip-gmp-check.patch
+    (fetchpatch2 {
+      name = "libc++-support.patch";
+      url = "https://github.com/linbox-team/givaro/commit/464d53db36038c36a72bbad48c97bc141f62e161.diff?full_index=1";
+      hash = "sha256-aI9PPjIQCvt9QKywxid+FVx71Buo8d6U7d+PLsKR4+k=";
+    })
   ];
 
   enableParallelBuilding = true;