--- base/BUILD.gn.orig	2023-11-03 10:09:45 UTC
+++ base/BUILD.gn
@@ -186,7 +186,7 @@ buildflag_header("ios_cronet_buildflags") {
   flags = [ "CRONET_BUILD=$is_cronet_build" ]
 }
 
-enable_message_pump_epoll = is_linux || is_chromeos || is_android
+enable_message_pump_epoll = (is_linux || is_chromeos || is_android) && !is_bsd
 buildflag_header("message_pump_buildflags") {
   header = "message_pump_buildflags.h"
   header_dir = "base/message_loop"
@@ -1101,11 +1101,23 @@ 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" ]
+  }
+
+  if (is_freebsd) {
+    libs += [
+      "execinfo",
+      "util",
+    ]
+  }
+
   if (use_allocator_shim) {
     if (is_apple) {
       sources += [ "allocator/early_zone_registration_apple.h" ]
@@ -1125,7 +1137,7 @@ 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" ]
   }
 
@@ -2077,6 +2089,22 @@ 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 += [
@@ -2209,6 +2237,29 @@ component("base") {
     }
   }
 
+  if (is_bsd) {
+    sources -= [
+      "files/file_path_watcher_inotify.cc",
+      "files/scoped_file_linux.cc",
+      "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",
+    ]
+    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",
@@ -2219,7 +2270,7 @@ component("base") {
   }
 
   if (dep_libevent) {
-    deps += [ "//third_party/libevent" ]
+    public_deps += [ "//third_party/libevent" ]
   }
 
   if (use_libevent) {
@@ -3599,7 +3650,7 @@ test("base_unittests") {
     ]
   }
 
-  if (is_linux || is_chromeos) {
+  if ((is_linux || is_chromeos) && !is_bsd) {
     sources += [
       "debug/proc_maps_linux_unittest.cc",
       "files/scoped_file_linux_unittest.cc",
@@ -3620,7 +3671,7 @@ test("base_unittests") {
       "posix/file_descriptor_shuffle_unittest.cc",
       "posix/unix_domain_socket_unittest.cc",
     ]
-    if (!is_nacl && !is_apple) {
+    if (!is_nacl && !is_apple && !is_bsd) {
       sources += [
         "profiler/stack_base_address_posix_unittest.cc",
         "profiler/stack_copier_signal_unittest.cc",
@@ -3631,7 +3682,7 @@ 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" ]
   }
 
@@ -3892,7 +3943,7 @@ test("base_unittests") {
     }
   }
 
-  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",