From 81c50550f3c8e87a3a7eb255b571c99d104161b8 Mon Sep 17 00:00:00 2001
From: Jean-Paul Calderone <exarkun@twistedmatrix.com>
Date: Fri, 13 Dec 2019 11:03:17 -0500
Subject: [PATCH] Pick up the right number of cores for the building system

---
 nix/tahoe-lafs.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nix/tahoe-lafs.nix b/nix/tahoe-lafs.nix
index ef7de49e0..b644d23a1 100644
--- a/nix/tahoe-lafs.nix
+++ b/nix/tahoe-lafs.nix
@@ -52,6 +52,6 @@ python.pkgs.buildPythonPackage rec {
   ];
 
   checkPhase = ''
-    ${python}/bin/python -m twisted.trial -j4 allmydata
+    ${python}/bin/python -m twisted.trial -j $NIX_BUILD_CORES allmydata
   '';
 }