Index: src/conditions/BUILD.tools
--- src/conditions/BUILD.tools.orig
+++ src/conditions/BUILD.tools
@@ -88,6 +88,15 @@ config_setting(
 )
 
 config_setting(
+    name = "openbsd_aarch64",
+    constraint_values = [
+        "@platforms//os:openbsd",
+        "@platforms//cpu:aarch64",
+    ],
+    visibility = ["//visibility:public"],
+)
+
+config_setting(
     name = "darwin_x86_64",
     constraint_values = [
         "@platforms//os:macos",
