--- build/config/linux/BUILD.gn.orig	2021-07-15 19:13:30 UTC
+++ build/config/linux/BUILD.gn
@@ -30,7 +30,7 @@ config("runtime_library") {
 
   if ((!(is_chromeos_ash || is_chromeos_lacros) ||
        default_toolchain != "//build/toolchain/cros:target") &&
-      (!use_custom_libcxx || current_cpu == "mipsel")) {
+      (!use_custom_libcxx || current_cpu == "mipsel") && !is_bsd) {
     libs = [ "atomic" ]
   }
 }