From f2cf00ca59f4155069348c8a8a848cf9974007f7 Mon Sep 17 00:00:00 2001
From: Amaan Qureshi <git@amaanq.com>
Date: Tue, 18 Aug 2026 21:31:22 -0400
Subject: [PATCH] qemu: enable parallel building

In 3e9186206e, the build, check and install phases were switched from
Ninja to Make, but stdenv only passes `-j` when `enableParallelBuilding`
is set. Due to this, QEMU's Makefile fell back to `-j1` for its Ninja
invocation, leading to very slow, serial builds.

This commit just sets `enableParallelBuilding` to true.
---
 pkgs/by-name/qe/qemu/package.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/by-name/qe/qemu/package.nix b/pkgs/by-name/qe/qemu/package.nix
index 7eb7facb578e..28399b8031c6 100644
--- a/pkgs/by-name/qe/qemu/package.nix
+++ b/pkgs/by-name/qe/qemu/package.nix
@@ -257,6 +257,7 @@ stdenv.mkDerivation (finalAttrs: {
   dontUseNinjaCheck = true;
   dontUseNinjaInstall = true;
   dontAddStaticConfigureFlags = true;
+  enableParallelBuilding = true;
 
   outputs = [ "out" ] ++ lib.optional enableDocs "doc" ++ lib.optional guestAgentSupport "ga";
   separateDebugInfo = true;