diff --git a/README.md b/README.md
index 1cf5972..6080d7b 100644
--- a/README.md
+++ b/README.md
@@ -56,19 +56,27 @@ Possible mitigation: Sandboxfs
 
 No dice.
 
-llvm 14:
+llvm 14: does not build at all:
+
+    $ bazel build --experimental_sandboxfs_path=sandboxfs --experimental_use_sandboxfs --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux //:zigzag-0
+    ERROR: /code/test-zigcc/BUILD:4:14: Compiling main.cc failed: (Exit 5): cc_wrapper.sh failed: error executing command external/llvm_toolchain_with_sysroot/bin/cc_wrapper.sh -U_FORTIFY_SOURCE '--target=x86_64-unknown-linux-gnu' -U_FORTIFY_SOURCE -fstack-protector -fno-omit-frame-pointer -fcolor-diagnostics -Wall ... (remaining 29 arguments skipped)
+
+    Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
+    ERROR: could not find clang; PWD="/proc/self/cwd"; PATH="<...>".
+    Target //:zigzag-0 failed to build
+    Use --verbose_failures to see the command lines of failed build steps.
+    INFO: Elapsed time: 7.578s, Critical Path: 0.26s
+    INFO: 3 processes: 3 internal.
+    FAILED: Build did NOT complete successfully
 
-    bazel build --experimental_sandboxfs_path=sandboxfs --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux //:zigzag-0
-    bazel clean; bazel shutdown
-    bazel --batch build --experimental_sandboxfs_path=sandboxfs --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux ...
-    INFO: Elapsed time: 96.803s, Critical Path: 12.42s
 
 zig cc:
 
-    bazel build --experimental_sandboxfs_path=sandboxfs --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 //:zigzag-0
+    bazel build --experimental_sandboxfs_path=sandboxfs --experimental_use_sandboxfs --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 //:zigzag-0
     bazel clean; bazel shutdown
-    bazel --batch build --experimental_sandboxfs_path=sandboxfs --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
-    INFO: Elapsed time: 109.347s, Critical Path: 13.94s
+    bazel --batch build --experimental_sandboxfs_path=sandboxfs --experimental_use_sandboxfs --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
+    INFO: Elapsed time: 126.613s, Critical Path: 17.63s
+
 
 Possible mitigation: `--experimental_reuse_sandbox_directories`
 ---------------------------------------------------------------