diff --git a/libs/cstr/rules.mk b/libs/cstr/rules.mk
new file mode 100644
index 0000000..2309c30
--- /dev/null
+++ b/libs/cstr/rules.mk
@@ -0,0 +1,28 @@
+# Copyright (C) 2024 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+MODULE := $(LOCAL_DIR)
+
+SRC_DIR := packages/modules/Virtualization/libs/cstr
+
+MODULE_SRCS := $(SRC_DIR)/src/lib.rs
+
+MODULE_CRATE_NAME := cstr
+
+MODULE_RUST_EDITION := 2021
+
+include make/library.mk