From c7657c0a136930ea5ce95bc0935e4f57492f2e18 Mon Sep 17 00:00:00 2001
From: Hythera <87016780+Hythera@users.noreply.github.com>
Date: Tue, 4 Aug 2026 23:02:58 +0200
Subject: [PATCH] buildMozillaMach: add support for extraPreConfigure

---
 pkgs/build-support/build-mozilla-mach/default.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/build-support/build-mozilla-mach/default.nix b/pkgs/build-support/build-mozilla-mach/default.nix
index 566d1f1a3a75..1132b07930e3 100644
--- a/pkgs/build-support/build-mozilla-mach/default.nix
+++ b/pkgs/build-support/build-mozilla-mach/default.nix
@@ -16,6 +16,7 @@
   extraPostPatch ? "",
   extraNativeBuildInputs ? [ ],
   extraConfigureFlags ? [ ],
+  extraPreConfigure ? "",
   extraBuildInputs ? [ ],
   extraMakeFlags ? [ ],
   extraPassthru ? { },
@@ -470,7 +471,8 @@ buildStdenv.mkDerivation {
     # linking firefox hits the vm.max_map_count kernel limit with the default musl allocator
     # TODO: Default vm.max_map_count has been increased, retest without this
     export LD_PRELOAD=${mimalloc}/lib/libmimalloc.so
-  '';
+  ''
+  + extraPreConfigure;
 
   # firefox has a different definition of configurePlatforms from nixpkgs, see configureFlags
   configurePlatforms = [ ];