From 9e510d0ab1eee6a3bd8483b3d291414fa97a8d0b Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Wed, 20 Oct 2021 09:06:28 +0100
Subject: [PATCH] libtorrent: enable paralell building

On 16-core machine build speeds up from 81s to 16s (~5x).
---
 pkgs/tools/networking/p2p/libtorrent/default.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/tools/networking/p2p/libtorrent/default.nix b/pkgs/tools/networking/p2p/libtorrent/default.nix
index 4d3ccf5fc150..9a635512f04f 100644
--- a/pkgs/tools/networking/p2p/libtorrent/default.nix
+++ b/pkgs/tools/networking/p2p/libtorrent/default.nix
@@ -18,6 +18,8 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkg-config autoreconfHook ];
   buildInputs = [ cppunit openssl libsigcxx zlib ];
 
+  enableParallelBuilding = true;
+
   meta = with lib; {
     homepage = "https://github.com/rakshasa/libtorrent";
     description = "A BitTorrent library written in C++ for *nix, with focus on high performance and good code";