From 7a34492ea451b8133262d134cc87f79402d11fef Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Wed, 20 Oct 2021 09:10:32 +0100
Subject: [PATCH] rtorrent: enable paralell building

On 16-core machine build speeds up from 90s to 19s (~4.7x).
---
 pkgs/tools/networking/p2p/rtorrent/default.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/tools/networking/p2p/rtorrent/default.nix b/pkgs/tools/networking/p2p/rtorrent/default.nix
index 20f9cec6f5fe..ead7d9f79fb5 100644
--- a/pkgs/tools/networking/p2p/rtorrent/default.nix
+++ b/pkgs/tools/networking/p2p/rtorrent/default.nix
@@ -35,6 +35,8 @@ stdenv.mkDerivation rec {
 
   configureFlags = [ "--with-xmlrpc-c" "--with-posix-fallocate" ];
 
+  enableParallelBuilding = true;
+
   postInstall = ''
     mkdir -p $out/share/man/man1 $out/share/doc/rtorrent
     mv doc/old/rtorrent.1 $out/share/man/man1/rtorrent.1