diff --git a/env.sh b/env.sh
index c5acd011..80e67f67 100644
--- a/env.sh
+++ b/env.sh
@@ -1,6 +1,6 @@
 export MAIN_ROOT=${PWD}
 
-export PATH=${MAIN_ROOT}:${MAIN_ROOT}/utils:${PATH}
+export PATH=${MAIN_ROOT}:${MAIN_ROOT}/utils:/usr/local/bin:${PATH}
 export LC_ALL=C
 
 # Use UTF-8 in Python to avoid UnicodeDecodeError when LC_ALL=C
diff --git a/speechnn/CMakeLists.txt b/speechnn/CMakeLists.txt
index 7fdb5f01..88182eb4 100644
--- a/speechnn/CMakeLists.txt
+++ b/speechnn/CMakeLists.txt
@@ -16,41 +16,41 @@ set(CMAKE_VERBOSE_MAKEFILE on)
 set(CMAKE_CXX_STANDARD 14)
 
 
-# fc_patch dir
-set(FETCHCONTENT_QUIET off)
-get_filename_component(fc_patch "fc_patch" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
-set(FETCHCONTENT_BASE_DIR ${fc_patch})
-
-
-###############################################################################
-# Option Configurations
-###############################################################################
-# option configurations 
-option(TEST_DEBUG "option for debug" OFF)
-
-
-###############################################################################
-# Add local library
-###############################################################################
-# system lib 
-find_package()
-# if dir have CmakeLists.txt 
-add_subdirectory()
-# if dir do not have CmakeLists.txt 
-add_library(lib_name STATIC file.cc)
-target_link_libraries(lib_name item0 item1)
-add_dependencies(lib_name depend-target)
-
-
-###############################################################################
-# Library installation
-###############################################################################
-install()
-
-
-###############################################################################
-# Build binary file
-###############################################################################
-add_executable()
-target_link_libraries()
-
+# # fc_patch dir
+# set(FETCHCONTENT_QUIET off)
+# get_filename_component(fc_patch "fc_patch" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
+# set(FETCHCONTENT_BASE_DIR ${fc_patch})
+# 
+# 
+# ###############################################################################
+# # Option Configurations
+# ###############################################################################
+# # option configurations 
+# option(TEST_DEBUG "option for debug" OFF)
+# 
+# 
+# ###############################################################################
+# # Add local library
+# ###############################################################################
+# # system lib 
+# find_package()
+# # if dir have CmakeLists.txt 
+# add_subdirectory()
+# # if dir do not have CmakeLists.txt 
+# add_library(lib_name STATIC file.cc)
+# target_link_libraries(lib_name item0 item1)
+# add_dependencies(lib_name depend-target)
+# 
+# 
+# ###############################################################################
+# # Library installation
+# ###############################################################################
+# install()
+# 
+# 
+# ###############################################################################
+# # Build binary file
+# ###############################################################################
+# add_executable()
+# target_link_libraries()
+# 
diff --git a/speechnn/cmake/third_party.cmake b/speechnn/cmake/third_party.cmake
index 7313cfa8..fdd7b53c 100644
--- a/speechnn/cmake/third_party.cmake
+++ b/speechnn/cmake/third_party.cmake
@@ -190,9 +190,8 @@ endif()
 
 ########################### include third_party according to flags ###############################
 include(third_party/libsndfile)      # download, build, install libsndfile 
-include(third_party/zlib)      # download, build, install zlib
 include(third_party/boost)     # download boost
 include(third_party/eigen)     # download eigen3
-include(third_party/threadpool)# download threadpool
+include(third_party/threadpool)     # download threadpool 
 
 
diff --git a/speechnn/cmake/third_party/absl.cmake b/speechnn/cmake/third_party/absl.cmake
index a060b88c..c2a8eceb 100644
--- a/speechnn/cmake/third_party/absl.cmake
+++ b/speechnn/cmake/third_party/absl.cmake
@@ -1,4 +1,5 @@
 cmake_minimum_required(VERSION 3.14)
+include(ExternalProject)
 include(FetchContent)
 
 FetchContent_Declare(
diff --git a/speechnn/cmake/third_party/libsndfile.cmake b/speechnn/cmake/third_party/libsndfile.cmake
index b555a873..05d5c6ed 100644
--- a/speechnn/cmake/third_party/libsndfile.cmake
+++ b/speechnn/cmake/third_party/libsndfile.cmake
@@ -1,4 +1,5 @@
 cmake_minimum_required(VERSION 3.14)
+include(ExternalProject)
 include(FetchContent)
 
 FetchContent_Declare(
diff --git a/speechnn/cmake/third_party/openfst.cmake b/speechnn/cmake/third_party/openfst.cmake
index d93ea24c..39f335a1 100644
--- a/speechnn/cmake/third_party/openfst.cmake
+++ b/speechnn/cmake/third_party/openfst.cmake
@@ -1,4 +1,5 @@
 cmake_minimum_required(VERSION 3.14)
+include(ExternalProject)
 include(FetchContent)
 
 FetchContent_Declare(