diff --git a/native/dicttoolkit/Android.mk b/native/dicttoolkit/Android.mk
new file mode 100644
index 0000000..118682d
--- /dev/null
+++ b/native/dicttoolkit/Android.mk
@@ -0,0 +1,67 @@
+# Copyright (C) 2014 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.
+
+ifeq (,$(TARGET_BUILD_APPS))
+
+# Only build if it's explicitly requested, or running mm/mmm.
+ifneq ($(ONE_SHOT_MAKEFILE)$(filter $(MAKECMDGOALS),dicttoolkit),)
+
+# HACK: Temporarily disable host tool build on Mac until the build system is ready for C++11.
+LATINIME_HOST_OSNAME := $(shell uname -s)
+ifneq ($(LATINIME_HOST_OSNAME), Darwin) # TODO: Remove this
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LATIN_IME_CORE_PATH := $(LOCAL_PATH)/../jni
+
+LATIN_IME_DICT_TOOLKIT_SRC_DIR := src
+LATIN_IME_CORE_SRC_DIR := ../jni/src
+
+LOCAL_CFLAGS += -Werror -Wall -Wextra -Weffc++ -Wformat=2 -Wcast-qual -Wcast-align \
+    -Wwrite-strings -Wfloat-equal -Wpointer-arith -Winit-self -Wredundant-decls \
+    -Woverloaded-virtual -Wsign-promo -Wno-system-headers
+
+# To suppress compiler warnings for unused variables/functions used for debug features etc.
+LOCAL_CFLAGS += -Wno-unused-parameter -Wno-unused-function
+LOCAL_CFLAGS += -std=c++11 -Wno-unused-parameter -Wno-unused-function
+
+include $(LOCAL_PATH)/NativeFileList.mk
+include $(LATIN_IME_CORE_PATH)/NativeFileList.mk
+
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/$(LATIN_IME_DICT_TOOLKIT_SRC_DIR) \
+    $(LATIN_IME_CORE_PATH)/$(LATIN_IME_CORE_SRC_DIR)
+
+LOCAL_SRC_FILES := $(LATIN_IME_DICT_TOOLKIT_MAIN_SRC_FILES) \
+    $(addprefix $(LATIN_IME_DICT_TOOLKIT_SRC_DIR)/, $(LATIN_IME_DICT_TOOLKIT_SRC_FILES)) \
+    $(addprefix $(LATIN_IME_CORE_SRC_DIR)/, $(LATIN_IME_CORE_SRC_FILES))
+
+LOCAL_MODULE := dicttoolkit
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_CLANG := true
+LOCAL_CXX_STL := libc++
+
+include $(BUILD_HOST_EXECUTABLE)
+#################### Clean up the tmp vars
+include $(LOCAL_PATH)/CleanupNativeFileList.mk
+#################### Unit test
+include $(LOCAL_PATH)/UnitTests.mk
+
+endif # Darwin - TODO: Remove this
+
+endif
+
+endif # TARGET_BUILD_APPS
diff --git a/native/dicttoolkit/CleanupNativeFileList.mk b/native/dicttoolkit/CleanupNativeFileList.mk
new file mode 100644
index 0000000..b804b41
--- /dev/null
+++ b/native/dicttoolkit/CleanupNativeFileList.mk
@@ -0,0 +1,17 @@
+# Copyright (C) 2014 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.
+
+LATIN_IME_DICT_TOOLKIT_MAIN_SRC_FILES :=
+LATIN_IME_DICT_TOOLKIT_SRC_FILES :=
+LATIN_IME_DICT_TOOLKIT_TEST_FILES :=
diff --git a/native/dicttoolkit/NativeFileList.mk b/native/dicttoolkit/NativeFileList.mk
new file mode 100644
index 0000000..b6be9c5
--- /dev/null
+++ b/native/dicttoolkit/NativeFileList.mk
@@ -0,0 +1,21 @@
+# Copyright (C) 2014 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.
+
+LATIN_IME_DICT_TOOLKIT_MAIN_SRC_FILES := \
+    dict_toolkit_main.cpp
+
+LATIN_IME_DICT_TOOLKIT_SRC_FILES :=
+
+LATIN_IME_DICT_TOOLKIT_TEST_FILES := \
+    dict_toolkit_defines_test.cpp
diff --git a/native/dicttoolkit/UnitTests.mk b/native/dicttoolkit/UnitTests.mk
new file mode 100644
index 0000000..d568db4
--- /dev/null
+++ b/native/dicttoolkit/UnitTests.mk
@@ -0,0 +1,68 @@
+# Copyright (C) 2014 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.
+
+ifeq (,$(TARGET_BUILD_APPS))
+
+LOCAL_PATH := $(call my-dir)
+
+######################################
+include $(CLEAR_VARS)
+
+LATIN_IME_CORE_PATH := $(LOCAL_PATH)/../jni
+
+LATIN_IME_DICT_TOOLKIT_SRC_DIR := src
+LATIN_IME_CORE_SRC_DIR := ../jni/src
+LATIN_DICT_TOOLKIT_TEST_SRC_DIR := tests
+
+include $(LOCAL_PATH)/NativeFileList.mk
+include $(LATIN_IME_CORE_PATH)/NativeFileList.mk
+
+# TODO: Remove -std=c++11 once it is set by default on host build.
+LATIN_IME_SRC_DIR := src
+LOCAL_ADDRESS_SANITIZER := true
+LOCAL_CFLAGS += -std=c++11 -Wno-unused-parameter -Wno-unused-function
+LOCAL_CLANG := true
+LOCAL_CXX_STL := libc++
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/$(LATIN_IME_DICT_TOOLKIT_SRC_DIR) \
+    $(LATIN_IME_CORE_PATH)/$(LATIN_IME_CORE_SRC_DIR)
+LOCAL_MODULE := liblatinime_dicttoolkit_host_static_for_unittests
+LOCAL_MODULE_TAGS := optional
+LOCAL_SRC_FILES := \
+    $(addprefix $(LATIN_IME_DICT_TOOLKIT_SRC_DIR)/, $(LATIN_IME_DICT_TOOLKIT_SRC_FILES)) \
+    $(addprefix $(LATIN_IME_CORE_SRC_DIR)/, $(LATIN_IME_CORE_SRC_FILES))
+include $(BUILD_HOST_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+# TODO: Remove -std=c++11 once it is set by default on host build.
+LOCAL_CFLAGS += -std=c++11 -Wno-unused-parameter -Wno-unused-function
+LOCAL_CLANG := true
+LOCAL_CXX_STL := libc++
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/$(LATIN_IME_DICT_TOOLKIT_SRC_DIR) \
+    $(LATIN_IME_CORE_PATH)/$(LATIN_IME_CORE_SRC_DIR)
+LOCAL_MODULE := dicttoolkit_unittests
+LOCAL_MODULE_TAGS := tests
+LOCAL_SRC_FILES := \
+    $(addprefix $(LATIN_DICT_TOOLKIT_TEST_SRC_DIR)/, $(LATIN_IME_DICT_TOOLKIT_TEST_FILES))
+LOCAL_STATIC_LIBRARIES += liblatinime_dicttoolkit_host_static_for_unittests
+include $(BUILD_HOST_NATIVE_TEST)
+
+include $(LOCAL_PATH)/CleanupNativeFileList.mk
+
+#################### Clean up the tmp vars
+LATINIME_HOST_OSNAME :=
+LATIN_IME_SRC_DIR :=
+LATIN_IME_TEST_SRC_DIR :=
+
+endif # TARGET_BUILD_APPS
diff --git a/native/dicttoolkit/dict_toolkit_main.cpp b/native/dicttoolkit/dict_toolkit_main.cpp
new file mode 100644
index 0000000..d71b50e
--- /dev/null
+++ b/native/dicttoolkit/dict_toolkit_main.cpp
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#include <cstdio>
+
+int main(int argc, char **argv) {
+    // TODO: Implement.
+    printf("%s\n", argv[0]);
+    return 0;
+}
diff --git a/native/dicttoolkit/run_tests.sh b/native/dicttoolkit/run_tests.sh
new file mode 100755
index 0000000..44c99c1
--- /dev/null
+++ b/native/dicttoolkit/run_tests.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+# Copyright 2014, 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.
+
+# check script arguments
+if [[ $(type -t mmm) != function ]]; then
+if [[ ${BASH_SOURCE[0]} != $0 ]]; then return; else exit 1; fi
+fi
+
+# Host build is never supported in unbundled (NDK/tapas) build
+if [[ -n $TARGET_BUILD_APPS ]]; then
+  echo "Host build is never supported in tapas build."  1>&2
+  echo "Use lunch command instead."  1>&2
+  if [[ ${BASH_SOURCE[0]} != $0 ]]; then return; else exit 1; fi
+fi
+
+test_name=dicttoolkit_unittests
+
+pushd $PWD > /dev/null
+cd $(gettop)
+(mmm -j16 packages/inputmethods/LatinIME/native/dicttoolkit) || (make -j16 $test_name)
+$ANDROID_HOST_OUT/bin/$test_name
+popd > /dev/null
diff --git a/native/dicttoolkit/src/dict_toolkit_defines.h b/native/dicttoolkit/src/dict_toolkit_defines.h
new file mode 100644
index 0000000..2a2104e
--- /dev/null
+++ b/native/dicttoolkit/src/dict_toolkit_defines.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#ifndef LATINIME_DICT_TOOLKIT_DEFINES_H
+#define LATINIME_DICT_TOOLKIT_DEFINES_H
+
+#include "defines.h"
+
+#endif // LATINIME_DICT_TOOLKIT_DEFINES_H
diff --git a/native/dicttoolkit/tests/dict_toolkit_defines_test.cpp b/native/dicttoolkit/tests/dict_toolkit_defines_test.cpp
new file mode 100644
index 0000000..3445bd0
--- /dev/null
+++ b/native/dicttoolkit/tests/dict_toolkit_defines_test.cpp
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#include "dict_toolkit_defines.h"
+
+#include <gtest/gtest.h>
+
+namespace latinime {
+namespace dicttoolkit {
+namespace {
+
+// Initial trivial test case.
+TEST(DictToolkitDefinesTest, TestKeycodeSpace) {
+    EXPECT_EQ(' ', KEYCODE_SPACE);
+}
+
+} // namespace
+} // namespace dicttoolkit
+} // namespace latinime