diff --git a/.gitignore b/.gitignore
index 28a415f..c839c85 100644
--- a/.gitignore
+++ b/.gitignore
@@ -65,3 +65,7 @@ dist/
 
 m.model
 m.vocab
+
+cmake_install.cmake
+libsentencepiece.so*
+libsentencepiece_train.so*
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ca45178..dc99a4d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,6 @@ option(SPM_NO_THREADLOCAL "Disable thread_local operator" OFF)
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-
 set(prefix ${CMAKE_INSTALL_PREFIX})
 set(exec_prefix "\${prefix}")
 set(libdir "\${exec_prefix}/lib")
@@ -86,6 +85,7 @@ if (SPM_BUILD_TEST)
 endif()
 
 add_subdirectory(src)
+add_subdirectory(third_party)
 
 set(CPACK_SOURCE_GENERATOR "TXZ")
 set(CPACK_GENERATOR "7Z")
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ebfcaa6..4703750 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -51,7 +51,7 @@ set(SPM_SRCS
   unigram_model.cc
   util.cc
   word_model.cc
-  ../third_party/absl/strings/string_view.cc)
+  ${CMAKE_CURRENT_SOURCE_DIR}/../third_party/absl/strings/string_view.cc)
 
 set(SPM_TRAIN_SRCS
   ${SPM_PROTO_HDRS}
diff --git a/third_party/CMakeLists.txt b/third_party/CMakeLists.txt
new file mode 100644
index 0000000..2529e53
--- /dev/null
+++ b/third_party/CMakeLists.txt
@@ -0,0 +1 @@
+include_directories(absl/strings darts_clone esaxx)