--- build/config/BUILDCONFIG.gn.orig	2026-09-01 03:36:21 UTC
+++ build/config/BUILDCONFIG.gn
@@ -224,8 +224,8 @@ if (host_toolchain == "") {
   # TODO(dpranke): Add some sort of assert here that verifies that
   # no toolchain omitted host_toolchain from its toolchain_args().
 
-  if (host_os == "linux") {
-    if (target_os != "linux") {
+  if (host_os == "linux" || host_os == "freebsd") {
+    if (target_os != "linux" && target_os != "freebsd") {
       host_toolchain = "//build/toolchain/linux:clang_$host_cpu"
     } else if (is_clang) {
       host_toolchain = "//build/toolchain/linux:clang_$host_cpu"
@@ -264,7 +264,7 @@ if (target_os == "android") {
   # Targeting android on Mac is best-effort and not guaranteed to work.
   assert(host_os == "linux", "Android builds are only supported on Linux.")
   _default_toolchain = "//build/toolchain/android:android_clang_$target_cpu"
-} else if (target_os == "chromeos" || target_os == "linux") {
+} else if (target_os == "chromeos" || target_os == "linux" || target_os == "freebsd") {
   # See comments in build/toolchain/cros/BUILD.gn about board compiles.
   if (is_clang) {
     _default_toolchain = "//build/toolchain/linux:clang_$target_cpu"
@@ -337,11 +337,12 @@ is_ios = current_os == "ios"
 is_chromeos = current_os == "chromeos"
 is_fuchsia = current_os == "fuchsia"
 is_ios = current_os == "ios"
-is_linux = current_os == "linux"
+is_linux = current_os == "linux" || current_os == "freebsd"
 is_mac = current_os == "mac"
 is_wasm = current_os == "emscripten"
 is_watchos = current_os == "watchos"
 is_win = current_os == "win" || current_os == "winuwp"
+is_bsd = current_os == "freebsd"
 
 is_apple = is_ios || is_mac || is_watchos
 is_posix = !is_win && !is_fuchsia
@@ -625,6 +626,8 @@ foreach(_target_type,
             filter_include([ _current_label ], STRICT_DEPS_EXCLUDE) == [] ||
             filter_include([ _current_label ], STRICT_DEPS_INCLUDE) != []
       }
+      # devel/gn predates check_includes_strict (added in gn 2489)
+      not_needed([ "check_includes_strict" ])
 
       if (use_libcxx_modules && is_clang) {
         if (strict_deps) {
@@ -637,6 +640,7 @@ foreach(_target_type,
       if (!defined(generate_modulemap)) {
         generate_modulemap = default_modulemap_mode
       }
+      not_needed([ "generate_modulemap" ])
 
       if (use_libcxx_modules) {
         # Add a dependency needed for Clang modules builds.
@@ -768,6 +772,8 @@ foreach(_target_type,
             filter_include([ _current_label ], STRICT_DEPS_EXCLUDE) == [] ||
             filter_include([ _current_label ], STRICT_DEPS_INCLUDE) != []
       }
+      # devel/gn predates check_includes_strict (added in gn 2489)
+      not_needed([ "check_includes_strict" ])
 
       if (use_libcxx_modules && is_clang) {
         if (strict_deps) {
@@ -780,6 +786,7 @@ foreach(_target_type,
       if (!defined(generate_modulemap)) {
         generate_modulemap = default_modulemap_mode
       }
+      not_needed([ "generate_modulemap" ])
 
       if (use_libcxx_modules) {
         # Add a dependency needed for Clang modules builds.