diff --git a/.bcr/presubmit.yml b/.bcr/presubmit.yml
index 5365a14fac..668ed1beed 100644
--- a/.bcr/presubmit.yml
+++ b/.bcr/presubmit.yml
@@ -4,3 +4,5 @@ tasks:
     platform: macos
     test_targets:
       - '@rules_apple//examples/macos/CommandLine:ExamplesBuildTest'
+    build_flags:
+    - "--repo_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1"