From 0badfc4936de7a895165ca170b422c443ca7e289 Mon Sep 17 00:00:00 2001
From: Nick Cao <nickcao@nichi.co>
Date: Sun, 16 Oct 2022 09:34:23 +0800
Subject: [PATCH] qt6.qtwebengine: correct how NIX_BUILD_CORES is propagated to
 the gn ninja

port of https://github.com/NixOS/nixpkgs/pull/37889
---
 pkgs/development/libraries/qt-6/modules/qtwebengine.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/libraries/qt-6/modules/qtwebengine.nix b/pkgs/development/libraries/qt-6/modules/qtwebengine.nix
index c365f3c06853..4dff38d3acc2 100644
--- a/pkgs/development/libraries/qt-6/modules/qtwebengine.nix
+++ b/pkgs/development/libraries/qt-6/modules/qtwebengine.nix
@@ -228,6 +228,10 @@ qtModule {
 
   requiredSystemFeatures = [ "big-parallel" ];
 
+  preConfigure = ''
+    export NINJAFLAGS="-j$NIX_BUILD_CORES"
+  '';
+
   postInstall = ''
     # This is required at runtime
     mkdir $out/libexec