diff --git a/src/core/main.cc b/src/core/main.cc
index 44dbc52..a4f45b0 100644
--- a/src/core/main.cc
+++ b/src/core/main.cc
@@ -1,5 +1,4 @@
 #include <algorithm>
-#include <thread>
 #include <iostream>
 #include <format>
 #include <map>
@@ -16,8 +15,6 @@
 
 #include <parallel_hashmap/phmap.h>
 
-#include "../../third_party/thread-pool/include/BS_thread_pool.hpp"
-
 using klotski::mover::MaskMover;
 using klotski::fast_cal::FastCal;
 
diff --git a/src/core_ffi/py_ffi/CMakeLists.txt b/src/core_ffi/py_ffi/CMakeLists.txt
index ed2e2d2..9a2911b 100644
--- a/src/core_ffi/py_ffi/CMakeLists.txt
+++ b/src/core_ffi/py_ffi/CMakeLists.txt
@@ -23,3 +23,7 @@ pybind11_add_module(klotski_py
 target_include_directories(klotski_py PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include)
 target_link_libraries(klotski_py PRIVATE klotski::core)
 set_target_properties(klotski_py PROPERTIES OUTPUT_NAME _klotski)
+
+if (SKBUILD)
+  install(TARGETS klotski_py DESTINATION .)
+endif()
diff --git a/src/core_ffi/py_ffi/packing/CMakeLists.txt b/src/core_ffi/py_ffi/packing/CMakeLists.txt
deleted file mode 100644
index f48e1d0..0000000
--- a/src/core_ffi/py_ffi/packing/CMakeLists.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-cmake_minimum_required(VERSION 3.12)
-
-project(klotski_py_demo VERSION "0.0.1")
-
-add_subdirectory(src/project)
-
-install(TARGETS klotski_py DESTINATION .)
diff --git a/src/core_ffi/py_ffi/packing/CMakeLists.txt b/src/core_ffi/py_ffi/packing/CMakeLists.txt
new file mode 120000
index 0000000..75f9ac9
--- /dev/null
+++ b/src/core_ffi/py_ffi/packing/CMakeLists.txt
@@ -0,0 +1 @@
+../../../../CMakeLists.txt
\ No newline at end of file
diff --git a/src/core_ffi/py_ffi/packing/MANIFEST.in b/src/core_ffi/py_ffi/packing/MANIFEST.in
index d36c238..ec9f3f7 100644
--- a/src/core_ffi/py_ffi/packing/MANIFEST.in
+++ b/src/core_ffi/py_ffi/packing/MANIFEST.in
@@ -1,8 +1,18 @@
-include CMakeLists.txt
-include README.md
 include pyproject.toml
 include setup.py
-include src/klotski/__init__.py
-recursive-include src/project *
-recursive-exclude src/project/src/core_ffi/py_ffi/packing *
+include README.md
 exclude MANIFEST.in
+
+include src/klotski/*.py
+
+include CMakeLists.txt
+include src/CMakeLists.txt
+include src/core_ffi/CMakeLists.txt
+
+recursive-include src/core *
+recursive-include src/core_ffi/py_ffi *
+recursive-exclude src/core_ffi/py_ffi/packing *
+
+include third_party/ThirdParty.cmake
+recursive-include third_party/pybind11 *
+recursive-include third_party/parallel-hashmap *
diff --git a/src/core_ffi/py_ffi/packing/setup.py b/src/core_ffi/py_ffi/packing/setup.py
index d6a760f..43d50f1 100644
--- a/src/core_ffi/py_ffi/packing/setup.py
+++ b/src/core_ffi/py_ffi/packing/setup.py
@@ -9,5 +9,6 @@ setup(
     packages=["klotski"],
     package_dir={"": "src"},
     cmake_install_dir="src/klotski",
+    cmake_args=['-DKLSK_ENABLE_TESTING=OFF', '-DKLSK_ENABLE_BENCHMARK=OFF', '-DKLSK_C_FFI=OFF', '-DKLSK_RUST_FFI=OFF', '-DKLSK_PYTHON_FFI=ON'],
     python_requires=">=3.9",
 )
diff --git a/src/core_ffi/py_ffi/packing/src/CMakeLists.txt b/src/core_ffi/py_ffi/packing/src/CMakeLists.txt
new file mode 120000
index 0000000..75f9ac9
--- /dev/null
+++ b/src/core_ffi/py_ffi/packing/src/CMakeLists.txt
@@ -0,0 +1 @@
+../../../../CMakeLists.txt
\ No newline at end of file
diff --git a/src/core_ffi/py_ffi/packing/src/core b/src/core_ffi/py_ffi/packing/src/core
new file mode 120000
index 0000000..58ffb12
--- /dev/null
+++ b/src/core_ffi/py_ffi/packing/src/core
@@ -0,0 +1 @@
+../../../../core
\ No newline at end of file
diff --git a/src/core_ffi/py_ffi/packing/src/core_ffi b/src/core_ffi/py_ffi/packing/src/core_ffi
new file mode 120000
index 0000000..e461ac9
--- /dev/null
+++ b/src/core_ffi/py_ffi/packing/src/core_ffi
@@ -0,0 +1 @@
+../../../../core_ffi/
\ No newline at end of file
diff --git a/src/core_ffi/py_ffi/packing/src/project b/src/core_ffi/py_ffi/packing/src/project
deleted file mode 120000
index 9bc160e..0000000
--- a/src/core_ffi/py_ffi/packing/src/project
+++ /dev/null
@@ -1 +0,0 @@
-../../../../../../klotski/
\ No newline at end of file
diff --git a/src/core_ffi/py_ffi/packing/third_party b/src/core_ffi/py_ffi/packing/third_party
new file mode 120000
index 0000000..b5207a7
--- /dev/null
+++ b/src/core_ffi/py_ffi/packing/third_party
@@ -0,0 +1 @@
+../../../../third_party/
\ No newline at end of file
diff --git a/third_party/ThirdParty.cmake b/third_party/ThirdParty.cmake
index 78e3af2..6423e21 100644
--- a/third_party/ThirdParty.cmake
+++ b/third_party/ThirdParty.cmake
@@ -9,6 +9,8 @@ if (KLSK_ENABLE_BENCHMARK)
   set(BENCHMARK_ENABLE_TESTING OFF)
   set(BENCHMARK_ENABLE_EXCEPTIONS OFF)
   add_subdirectory(${KLSK_THIRD_PARTY}/benchmark EXCLUDE_FROM_ALL)
+
+  # TODO: enable bs::thread_pool
 endif()
 
 if (KLSK_ENABLE_TESTING)