diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index 5929c96..9e66335 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -5,14 +5,12 @@ build_targets: &build_targets
   - "//examples/..."
   - "//tests/..."
   - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
-  - "-//tests/rule_based_toolchain/tool_map:_duplicate_tool_test_subject" # Intentionally broken rule.
 test_targets: &test_targets
   - "//:all"
   - "//cc/..."
   - "//examples/..."
   - "//tests/..."
   - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
-  - "-//tests/rule_based_toolchain/tool_map:_duplicate_tool_test_subject" # Intentionally broken rule.
 
 build_targets_bazel_6: &build_targets_bazel_6
   - "//:all"
@@ -22,7 +20,6 @@ build_targets_bazel_6: &build_targets_bazel_6
   - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
   - "-//tests/rule_based_toolchain/..." # proto.encode_text doesn't support None
   - "-//cc:optional_current_cc_toolchain" # Not supported in Bazel 6
-  - "-//tests/rule_based_toolchain/tool_map:_duplicate_tool_test_subject" # Intentionally broken rule.
 test_targets_bazel_6: &test_targets_bazel_6
   - "//:all"
   - "//cc:all"
@@ -31,7 +28,6 @@ test_targets_bazel_6: &test_targets_bazel_6
   - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
   - "-//tests/rule_based_toolchain/..." # proto.encode_text doesn't support None
   - "-//cc:optional_current_cc_toolchain" # Not supported in Bazel 6
-  - "-//tests/rule_based_toolchain/tool_map:_duplicate_tool_test_subject" # Intentionally broken rule.
 
 buildifier:
   version: latest
@@ -79,7 +75,6 @@ tasks:
       - "//tests/..."
       - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
       - "-//tests/system_library:system_library_test" # Fails because of repo setup
-      - "-//tests/rule_based_toolchain/tool_map:_duplicate_tool_test_subject" # Intentionally broken rule.
   macos_head:
     name: MacOS (Bazel HEAD)
     bazel: last_green
diff --git a/.bazelrc b/.bazelrc
new file mode 100644
index 0000000..a244d62
--- /dev/null
+++ b/.bazelrc
@@ -0,0 +1,2 @@
+# Required by abseil-cpp.
+common --cxxopt=-std=c++14
diff --git a/MODULE.bazel b/MODULE.bazel
index 978bd5c..b1ae8e8 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -13,6 +13,7 @@ use_repo(cc_configure, "local_config_cc", "local_config_cc_toolchains")
 
 register_toolchains("@local_config_cc_toolchains//:all")
 
+bazel_dep(name = "rules_shell", version = "0.2.0", dev_dependency = True)
 bazel_dep(name = "googletest", version = "1.15.2", dev_dependency = True)
 bazel_dep(name = "rules_testing", version = "0.6.0", dev_dependency = True)
 bazel_dep(name = "stardoc", version = "0.7.0", dev_dependency = True)
diff --git a/WORKSPACE b/WORKSPACE
index 02be83e..609acf9 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -24,6 +24,19 @@ load("@bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
 
 bazel_skylib_workspace()
 
+http_archive(
+    name = "rules_shell",
+    sha256 = "410e8ff32e018b9efd2743507e7595c26e2628567c42224411ff533b57d27c28",
+    strip_prefix = "rules_shell-0.2.0",
+    url = "https://github.com/bazelbuild/rules_shell/releases/download/v0.2.0/rules_shell-v0.2.0.tar.gz",
+)
+
+load("@rules_shell//shell:repositories.bzl", "rules_shell_dependencies", "rules_shell_toolchains")
+
+rules_shell_dependencies()
+
+rules_shell_toolchains()
+
 http_archive(
     name = "rules_testing",
     sha256 = "02c62574631876a4e3b02a1820cb51167bb9cdcdea2381b2fa9d9b8b11c407c4",
diff --git a/tests/system_library/BUILD b/tests/system_library/BUILD
index 3c8d577..215ba2c 100644
--- a/tests/system_library/BUILD
+++ b/tests/system_library/BUILD
@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+load("@rules_shell//shell:sh_test.bzl", "sh_test")
+
 sh_test(
     name = "system_library_test",
     size = "small",