--- base/BUILD.gn.orig	2026-05-12 08:53:52 UTC
+++ base/BUILD.gn
@@ -1169,11 +1169,27 @@ component("base") {
   # Needed for <atomic> if using newer C++ library than sysroot, except if
   # building inside the cros_sdk environment - use host_toolchain as a
   # more robust check for this.
-  if (!use_sysroot && (is_android || is_chromeos || (is_linux && !is_castos)) &&
+  if (!use_sysroot && (is_android || is_chromeos || (is_linux && !is_castos && !is_bsd)) &&
       host_toolchain != "//build/toolchain/cros:host") {
     libs += [ "atomic" ]
   }
 
+  # *BSD needs libkvm
+  if (is_bsd) {
+    libs += [
+      "kvm",
+      "epoll-shim",
+    ]
+  }
+
+  if (is_freebsd) {
+    libs += [
+      "execinfo",
+      "util",
+      "z",
+    ]
+  }
+
   if (use_allocator_shim) {
     if (is_apple) {
       sources += [ "allocator/early_zone_registration_apple.h" ]
@@ -1193,7 +1209,7 @@ component("base") {
 
   # Allow more direct string conversions on platforms with native utf8
   # strings
-  if (is_apple || is_chromeos || is_castos || is_cast_android || is_fuchsia) {
+  if (is_apple || is_chromeos || is_castos || is_cast_android || is_fuchsia || is_bsd) {
     defines += [ "SYSTEM_NATIVE_UTF8" ]
   }
 
@@ -2205,6 +2221,22 @@ component("base") {
     ]
   }
 
+  if (is_openbsd) {
+    sources += [
+      "process/process_handle_openbsd.cc",
+      "process/process_iterator_openbsd.cc",
+      "process/process_metrics_openbsd.cc",
+      "system/sys_info_openbsd.cc",
+    ]
+  } else if (is_freebsd) {
+    sources += [
+      "process/process_handle_freebsd.cc",
+      "process/process_iterator_freebsd.cc",
+      "process/process_metrics_freebsd.cc",
+      "system/sys_info_freebsd.cc",
+    ]
+  }
+
   # iOS
   if (is_ios) {
     sources += [
@@ -2379,6 +2411,33 @@ component("base") {
     }
   }
 
+  if (is_bsd) {
+    sources -= [
+      "files/file_path_watcher_inotify.cc",
+      "files/scoped_file_linux.cc",
+      "process/set_process_title_linux.cc",
+      "process/set_process_title_linux.h",
+      "system/sys_info_linux.cc",
+      "process/process_iterator_linux.cc",
+      "process/process_linux.cc",
+      "process/process_metrics_linux.cc",
+      "process/process_handle_linux.cc",
+      "profiler/stack_copier_signal.cc",
+      "profiler/stack_copier_signal.h",
+      "profiler/thread_delegate_posix.cc",
+      "profiler/thread_delegate_posix.h",
+      "threading/platform_thread_linux.cc",
+      "stack_canary_linux.cc",
+      "stack_canary_linux.h",
+    ]
+    sources += [
+      "files/file_path_watcher_kqueue.cc",
+      "files/file_path_watcher_kqueue.h",
+      "files/file_path_watcher_bsd.cc",
+      "threading/platform_thread_bsd.cc",
+    ]
+  }
+
   if (use_blink) {
     sources += [
       "files/file_path_watcher.cc",
@@ -2870,7 +2929,7 @@ buildflag_header("protected_memory_buildflags") {
   header = "protected_memory_buildflags.h"
   header_dir = "base/memory"
 
-  protected_memory_enabled = !is_component_build && is_clang &&
+  protected_memory_enabled = !is_openbsd && !is_component_build && is_clang &&
                              (is_win || is_linux || is_android || is_mac)
 
   flags = [ "PROTECTED_MEMORY_ENABLED=$protected_memory_enabled" ]
@@ -3383,7 +3442,7 @@ if (is_apple) {
   }
 }
 
-if (is_linux || is_chromeos) {
+if (!is_bsd && (is_linux || is_chromeos)) {
   # This test must compile with -fstack-protector-all
   source_set("stack_canary_linux_unittests") {
     testonly = true
@@ -4128,7 +4187,7 @@ test("base_unittests") {
     configs += [ ":delayload_esent_dll" ]
   }
 
-  if (is_linux || is_chromeos) {
+  if (!is_bsd && (is_linux || is_chromeos)) {
     sources += [
       "debug/proc_maps_linux_unittest.cc",
       "files/scoped_file_linux_unittest.cc",
@@ -4153,7 +4212,7 @@ test("base_unittests") {
       "posix/file_descriptor_shuffle_unittest.cc",
       "posix/unix_domain_socket_unittest.cc",
     ]
-    if (!is_apple) {
+    if (!is_apple && !is_bsd) {
       sources += [
         "profiler/stack_base_address_posix_unittest.cc",
         "profiler/stack_copier_signal_unittest.cc",
@@ -4164,7 +4223,7 @@ test("base_unittests") {
 
   # Allow more direct string conversions on platforms with native utf8
   # strings
-  if (is_apple || is_chromeos || is_castos || is_cast_android || is_fuchsia) {
+  if (is_apple || is_chromeos || is_castos || is_cast_android || is_fuchsia || is_bsd) {
     defines += [ "SYSTEM_NATIVE_UTF8" ]
   }
 
@@ -4347,7 +4406,7 @@ test("base_unittests") {
     deps += [ ":base_profiler_test_support_library" ]
   }
 
-  if (is_fuchsia || is_linux || is_chromeos) {
+  if ((is_fuchsia || is_linux || is_chromeos) && !is_bsd) {
     sources += [
       "debug/elf_reader_unittest.cc",
       "debug/test_elf_image_builder.cc",
