diff --git a/pkgs/applications/networking/browsers/firefox/common.nix b/pkgs/applications/networking/browsers/firefox/common.nix
index 9321e491099..948adc407d7 100644
--- a/pkgs/applications/networking/browsers/firefox/common.nix
+++ b/pkgs/applications/networking/browsers/firefox/common.nix
@@ -65,6 +65,7 @@
 , xorg
 , zip
 , zlib
+, pkgsBuildBuild
 
 # optionals
 
@@ -139,16 +140,21 @@ let
 
   # Target the LLVM version that rustc is built with for LTO.
   llvmPackages0 = rustc.llvmPackages;
+  llvmPackagesBuildBuild0 = pkgsBuildBuild.rustc.llvmPackages;
 
   # Force the use of lld and other llvm tools for LTO
   llvmPackages = llvmPackages0.override {
     bootBintoolsNoLibc = null;
     bootBintools = null;
   };
+  llvmPackagesBuildBuild = llvmPackagesBuildBuild0.override {
+    bootBintoolsNoLibc = null;
+    bootBintools = null;
+  };
 
   # LTO requires LLVM bintools including ld.lld and llvm-ar.
   buildStdenv = overrideCC llvmPackages.stdenv (llvmPackages.stdenv.cc.override {
-    inherit (llvmPackages) bintools;
+    bintools = if ltoSupport then buildPackages.rustc.llvmPackages.bintools else stdenv.cc.bintools;
   });
 
   # Compile the wasm32 sysroot to build the RLBox Sandbox
@@ -193,10 +199,15 @@ buildStdenv.mkDerivation ({
   # two patches.
   patchFlags = [ "-p1" "-l" ];
 
+  # if not explicitly set, wrong cc from buildStdenv would be used
+  HOST_CC = "${llvmPackagesBuildBuild.stdenv.cc}/bin/cc";
+  HOST_CXX = "${llvmPackagesBuildBuild.stdenv.cc}/bin/c++";
+
   nativeBuildInputs = [
     autoconf
     cargo
-    llvmPackages.llvm # llvm-objdump
+    gnum4
+    llvmPackagesBuildBuild.bintools
     makeWrapper
     nodejs
     perl
@@ -273,13 +284,16 @@ buildStdenv.mkDerivation ({
     export MOZILLA_OFFICIAL=1
   '';
 
+  # firefox has a different definition of configurePlatforms from nixpkgs, see configureFlags
+  configurePlatforms = [ ];
+
   configureFlags = [
     "--disable-tests"
     "--disable-updater"
     "--enable-application=${application}"
     "--enable-default-toolkit=cairo-gtk3${lib.optionalString waylandSupport "-wayland"}"
     "--enable-system-pixman"
-    "--with-libclang-path=${llvmPackages.libclang.lib}/lib"
+    "--with-libclang-path=${llvmPackagesBuildBuild.libclang.lib}/lib"
     "--with-system-ffi"
     "--with-system-icu"
     "--with-system-jpeg"
@@ -290,6 +304,9 @@ buildStdenv.mkDerivation ({
     "--with-system-png" # needs APNG support
     "--with-system-webp"
     "--with-system-zlib"
+    # for firefox, host is buildPlatform, target is hostPlatform
+    "--host=${buildStdenv.buildPlatform.config}"
+    "--target=${buildStdenv.hostPlatform.config}"
   ]
   # LTO is done using clang and lld on Linux.
   ++ lib.optionals ltoSupport [
@@ -332,7 +349,6 @@ buildStdenv.mkDerivation ({
     fontconfig
     freetype
     glib
-    gnum4
     gtk3
     icu
     libffi
diff --git a/pkgs/development/compilers/rust/1_60.nix b/pkgs/development/compilers/rust/1_60.nix
index 0153b5d23a9..16f8512952d 100644
--- a/pkgs/development/compilers/rust/1_60.nix
+++ b/pkgs/development/compilers/rust/1_60.nix
@@ -33,7 +33,7 @@ import ./default.nix {
   llvmShared = llvm_14.override { enableSharedLibraries = true; };
 
   # Expose llvmPackages used for rustc from rustc via passthru for LTO in Firefox
-  llvmPackagesForBuild = pkgsBuildBuild.llvmPackages_14;
+  llvmPackages = llvmPackages_14;
 
   # Note: the version MUST be one version prior to the version we're
   # building
diff --git a/pkgs/development/compilers/rust/default.nix b/pkgs/development/compilers/rust/default.nix
index 6dfc8a49063..6c579373f5d 100644
--- a/pkgs/development/compilers/rust/default.nix
+++ b/pkgs/development/compilers/rust/default.nix
@@ -10,7 +10,7 @@
 , llvmSharedForBuild
 , llvmSharedForHost
 , llvmSharedForTarget
-, llvmPackagesForBuild # Exposed through rustc for LTO in Firefox
+, llvmPackages # Exposed through rustc for LTO in Firefox
 }:
 { stdenv, lib
 , buildPackages
@@ -64,7 +64,7 @@ in
         version = rustcVersion;
         sha256 = rustcSha256;
         inherit enableRustcDev;
-        inherit llvmShared llvmSharedForBuild llvmSharedForHost llvmSharedForTarget llvmPackagesForBuild;
+        inherit llvmShared llvmSharedForBuild llvmSharedForHost llvmSharedForTarget llvmPackages;
 
         patches = rustcPatches;
 
diff --git a/pkgs/development/compilers/rust/rustc.nix b/pkgs/development/compilers/rust/rustc.nix
index 1087ac05908..d167cf91c36 100644
--- a/pkgs/development/compilers/rust/rustc.nix
+++ b/pkgs/development/compilers/rust/rustc.nix
@@ -1,5 +1,5 @@
 { lib, stdenv, removeReferencesTo, pkgsBuildBuild, pkgsBuildHost, pkgsBuildTarget
-, llvmShared, llvmSharedForBuild, llvmSharedForHost, llvmSharedForTarget, llvmPackagesForBuild
+, llvmShared, llvmSharedForBuild, llvmSharedForHost, llvmSharedForTarget, llvmPackages
 , fetchurl, file, python3
 , darwin, cmake, rust, rustPlatform
 , pkg-config, openssl
@@ -179,7 +179,7 @@ in stdenv.mkDerivation rec {
 
   passthru = {
     llvm = llvmShared;
-    llvmPackages = llvmPackagesForBuild;
+    inherit llvmPackages;
   };
 
   meta = with lib; {
diff --git a/pkgs/misc/sndio/default.nix b/pkgs/misc/sndio/default.nix
index 7b5774d8054..ea2229f264e 100644
--- a/pkgs/misc/sndio/default.nix
+++ b/pkgs/misc/sndio/default.nix
@@ -11,6 +11,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
   buildInputs = lib.optional stdenv.hostPlatform.isLinux alsa-lib;
+  configurePlatforms = [];
 
   postInstall = ''
     install -Dm644 contrib/sndiod.service $out/lib/systemd/system/sndiod.service
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6ec9e9917f0..d9f31ad43e4 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -26452,11 +26452,7 @@ with pkgs;
 
   filezilla = callPackage ../applications/networking/ftp/filezilla { };
 
-  buildMozillaMach =
-    let callPackage = newScope {
-      inherit (rustPackages) cargo rustc;
-    };
-    in opts: callPackage (import ../applications/networking/browsers/firefox/common.nix opts) {};
+  buildMozillaMach = opts: callPackage (import ../applications/networking/browsers/firefox/common.nix opts) {};
 
   firefoxPackages = recurseIntoAttrs (callPackage ../applications/networking/browsers/firefox/packages.nix {});