patch-BUILD.gn

--- BUILD.gn.orig	2021-11-15 18:52:12 UTC
+++ BUILD.gn
@@ -5090,7 +5090,7 @@ v8_component("v8_libbase") {
     }
   }
 
-  if (is_linux || is_chromeos) {
+  if ((is_linux || is_chromeos) && !is_bsd) {
     sources += [
       "src/base/debug/stack_trace_posix.cc",
       "src/base/platform/platform-linux.cc",
@@ -5107,6 +5107,12 @@ v8_component("v8_libbase") {
     ]
 
     libs = [ "dl" ]
+  } else if (is_bsd) {
+    sources += [
+      "src/base/debug/stack_trace_posix.cc",
+      "src/base/platform/platform-freebsd.cc",
+    ]
+    libs = [ "rt", "execinfo" ]
   } else if (is_android) {
     if (current_toolchain == host_toolchain) {
       libs = [
@@ -5607,6 +5613,7 @@ if (v8_monolithic) {
       ":v8_libplatform",
       "//build/win:default_exe_manifest",
     ]
+    libs = ["execinfo"]
 
     configs = [ ":internal_config" ]
   }