diff --git a/tools/Android.bp b/tools/Android.bp
new file mode 100644
index 0000000..b44c296
--- /dev/null
+++ b/tools/Android.bp
@@ -0,0 +1 @@
+subdirs = ["*"]
diff --git a/tools/relocation_packer/Android.bp b/tools/relocation_packer/Android.bp
new file mode 100644
index 0000000..2907b31
--- /dev/null
+++ b/tools/relocation_packer/Android.bp
@@ -0,0 +1,84 @@
+//
+// Copyright (C) 2015 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.
+//
+
+cc_defaults {
+    name: "relocation_packer_flags",
+    cppflags: [
+        "-Wall",
+        "-Wextra",
+        "-Wunused",
+        "-Werror",
+        "-Wold-style-cast",
+    ],
+
+    target: {
+        darwin: {
+            enabled: false,
+        },
+    },
+}
+
+cc_library_host_static {
+    name: "lib_relocation_packer",
+    defaults: ["relocation_packer_flags"],
+    srcs: [
+        "src/debug.cc",
+        "src/delta_encoder.cc",
+        "src/elf_file.cc",
+        "src/packer.cc",
+        "src/sleb128.cc",
+    ],
+
+    static_libs: [
+        "libelf",
+        "libz",
+    ],
+}
+
+cc_binary_host {
+    name: "relocation_packer",
+    defaults: ["relocation_packer_flags"],
+
+    srcs: ["src/main.cc"],
+    static_libs: [
+        "lib_relocation_packer",
+        "libelf",
+        "libz",
+        "libbase",
+    ],
+
+    // Statically linking libc++ to make it work from prebuilts
+    stl: "libc++_static",
+}
+
+cc_test_host {
+    name: "relocation_packer_unit_tests",
+    defaults: ["relocation_packer_flags"],
+
+    srcs: [
+        "src/debug_unittest.cc",
+        "src/delta_encoder_unittest.cc",
+        "src/elf_file_unittest.cc",
+        "src/sleb128_unittest.cc",
+        "src/packer_unittest.cc",
+    ],
+
+    static_libs: [
+        "lib_relocation_packer",
+        "libelf",
+        "libz",
+    ],
+}
diff --git a/tools/relocation_packer/Android.mk b/tools/relocation_packer/Android.mk
index bdb54b7..80208ec 100644
--- a/tools/relocation_packer/Android.mk
+++ b/tools/relocation_packer/Android.mk
@@ -15,63 +15,6 @@
 #
 
 ifeq ($(HOST_OS),linux)
-common_cppflags := -Wall -Wextra -Wunused -Werror -Wold-style-cast
-
-LOCAL_PATH := $(call my-dir)
-
-include $(CLEAR_VARS)
-
-LOCAL_CPP_EXTENSION := .cc
-
-LOCAL_SRC_FILES := \
-  src/debug.cc \
-  src/delta_encoder.cc \
-  src/elf_file.cc \
-  src/packer.cc \
-  src/sleb128.cc \
-
-LOCAL_STATIC_LIBRARIES := libelf libz
-LOCAL_MODULE := lib_relocation_packer
-
-LOCAL_CPPFLAGS := $(common_cppflags)
-
-include $(BUILD_HOST_STATIC_LIBRARY)
-
-include $(CLEAR_VARS)
-
-LOCAL_CPP_EXTENSION := .cc
-
-LOCAL_SRC_FILES := src/main.cc
-LOCAL_STATIC_LIBRARIES := lib_relocation_packer libelf libz libbase
-
-# Statically linking libc++ to make it work from prebuilts
-LOCAL_CXX_STL := libc++_static
-
-LOCAL_MODULE := relocation_packer
-
-LOCAL_CPPFLAGS := $(common_cppflags)
-
-include $(BUILD_HOST_EXECUTABLE)
-
-include $(CLEAR_VARS)
-
-LOCAL_CPP_EXTENSION := .cc
-
-LOCAL_SRC_FILES := \
-  src/debug_unittest.cc \
-  src/delta_encoder_unittest.cc \
-  src/elf_file_unittest.cc \
-  src/sleb128_unittest.cc \
-  src/packer_unittest.cc \
-
-LOCAL_STATIC_LIBRARIES := lib_relocation_packer libelf libz
-
-LOCAL_CPPFLAGS := $(common_cppflags)
-
-LOCAL_MODULE := relocation_packer_unit_tests
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
-
-include $(BUILD_HOST_NATIVE_TEST)
 
 # $(1) library name
 define copy-test-library