--- base/BUILD.gn.orig	2021-05-24 22:05:31 UTC
+++ base/BUILD.gn
@@ -963,7 +963,7 @@ component("base") {
       "timer/hi_res_timer_manager_posix.cc",
     ]
 
-    if (!is_nacl && !is_apple) {
+    if (!is_nacl && !is_apple && !is_bsd) {
       sources += [
         "cpu_affinity_posix.cc",
         "cpu_affinity_posix.h",
@@ -974,6 +974,11 @@ component("base") {
         "profiler/thread_delegate_posix.h",
       ]
     }
+    if (is_bsd) {
+      sources += [
+        "profiler/stack_sampler_posix.cc",
+      ]
+    }
   }
 
   if (is_win) {
@@ -1377,7 +1382,7 @@ component("base") {
   # building inside the cros_sdk environment - use host_toolchain as a
   # more robust check for this.
   if (!use_sysroot &&
-      (is_android || ((is_linux || is_chromeos) && !is_chromecast)) &&
+      (is_android || ((is_linux || is_chromeos) && !is_chromecast) && !is_clang) &&
       host_toolchain != "//build/toolchain/cros:host") {
     libs += [ "atomic" ]
   }
@@ -1430,7 +1435,7 @@ component("base") {
           "allocator/allocator_shim_default_dispatch_to_mac_zoned_malloc.cc",
         ]
       }
-      if (is_chromeos || is_linux) {
+      if ((is_chromeos || is_linux) && !is_bsd) {
         sources += [ "allocator/allocator_shim_default_dispatch_to_glibc.cc" ]
       }
       if (is_win) {
@@ -2064,6 +2069,34 @@ component("base") {
     }
   }
 
+  if (is_bsd) {
+    sources -= [
+      "files/file_path_watcher_linux.cc",
+      "files/file_util_linux.cc",
+      "process/memory_linux.cc",
+      "process/process_handle_linux.cc",
+      "process/process_iterator_linux.cc",
+      "process/process_metrics_linux.cc",
+      "system/sys_info_linux.cc"
+    ]
+    sources += [
+      "files/file_path_watcher_freebsd.cc",
+      "files/file_path_watcher_kqueue.cc",
+      "files/file_path_watcher_kqueue.h",
+      "process/memory_stubs.cc",
+      "process/process_handle_freebsd.cc",
+      "process/process_iterator_freebsd.cc",
+      "process/process_metrics_freebsd.cc",
+      "system/sys_info_freebsd.cc",
+    ]
+    libs = [
+      "execinfo", # logging.cc
+      "kvm",      # process_metrics_freebsd
+      "util"      # process_metrics_freebsd
+    ]
+  }
+
+
   # iOS
   if (is_ios) {
     sources -= [
@@ -3273,7 +3306,7 @@ if (build_base_unittests) {
       }
     }
 
-    if (is_linux || is_chromeos) {
+    if ((is_linux || is_chromeos) && !is_bsd) {
       sources += [ "debug/proc_maps_linux_unittest.cc" ]
     }
 
@@ -3313,7 +3346,7 @@ if (build_base_unittests) {
         "posix/unix_domain_socket_unittest.cc",
         "task/thread_pool/task_tracker_posix_unittest.cc",
       ]
-      if (!is_nacl && !is_apple) {
+      if (!is_nacl && !is_apple && !is_bsd) {
         sources += [
           "cpu_affinity_posix_unittest.cc",
           "profiler/stack_copier_signal_unittest.cc",