From 55223a8a6a92523f51e24f7774912068f9d2eef8 Mon Sep 17 00:00:00 2001
From: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Date: Tue, 26 Mar 2019 00:11:02 -0400
Subject: [PATCH] pythonPackages.pyarrow: enable parallel build

---
 pkgs/development/python-modules/pyarrow/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/python-modules/pyarrow/default.nix b/pkgs/development/python-modules/pyarrow/default.nix
index d568cea7851..125967c6fd6 100644
--- a/pkgs/development/python-modules/pyarrow/default.nix
+++ b/pkgs/development/python-modules/pyarrow/default.nix
@@ -25,6 +25,10 @@ buildPythonPackage rec {
     "-DCMAKE_POLICY_DEFAULT_CMP0025=NEW"
   ];
 
+  preBuild = ''
+    export PYARROW_PARALLEL=$NIX_BUILD_CORES
+  '';
+
   preCheck = ''
     rm pyarrow/tests/test_jvm.py
     rm pyarrow/tests/test_hdfs.py