diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index f46a0181..1a523794 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -9,6 +9,19 @@ on:
       - bugfix/*
       - feature/*
 jobs:
+  sdist:
+    name: build sdist wheel
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: |
+          make preprocess
+          python -m pip install --upgrade pip
+          python -m pip install build setuptools wheel
+          python -m build --sdist
+      - uses: actions/upload-artifact@v3
+        with:
+          path: ./dist/*.tar.gz
   bdist:
     name: build bdist wheels and test
     runs-on: ${{ matrix.os }}
diff --git a/MANIFEST.in b/MANIFEST.in
index b3c68460..3318a7e1 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,6 @@
-include curl_cffi/_wrapper.*
-include curl_cffi/ffi/*
-include curl_cffi/include/curl/*
+recursive-include tests/*
+
+include ffi/*
+include include/curl/*
+include scripts/build.py
+include Makefile
diff --git a/Makefile b/Makefile
index 5ed30e75..c4d8f485 100644
--- a/Makefile
+++ b/Makefile
@@ -19,14 +19,13 @@ curl-impersonate-$(VERSION)/chrome/patches: $(CURL_VERSION)
 		-o "curl-impersonate-$(VERSION).tar.gz"
 	tar -xf curl-impersonate-$(VERSION).tar.gz
 
-# TODO add the headers to sdist package
 curl_cffi/include/curl/curl.h: curl-impersonate-$(VERSION)/chrome/patches
 	cd $(CURL_VERSION)
 	for p in $</curl-*.patch; do patch -p1 < ../$$p; done
 	# Re-generate the configure script
 	autoreconf -fi
-	mkdir -p ../curl_cffi/include/curl
-	cp -R include/curl/* ../curl_cffi/include/curl/
+	mkdir -p ../include/curl
+	cp -R include/curl/* ../include/curl/
 
 preprocess: .preprocessed
 	@echo preprocess
@@ -50,6 +49,6 @@ clean:
 	rm -rf build/ dist/ curl_cffi.egg-info/ $(CURL_VERSION)/ curl-impersonate-$(VERSION)/
 	rm -rf curl_cffi/*.o curl_cffi/*.so curl_cffi/_wrapper.c
 	rm -rf .preprocessed .so_downloaded $(CURL_VERSION).tar.xz curl-impersonate-$(VERSION).tar.gz
-	rm -rf curl_cffi/include/
+	rm -rf include/
 
 .PHONY: clean build test install-local upload preprocess
diff --git a/curl_cffi/build.py b/curl_cffi/build.py
deleted file mode 100644
index e0a88a74..00000000
--- a/curl_cffi/build.py
+++ /dev/null
@@ -1,53 +0,0 @@
-import os
-import struct
-import platform
-
-from cffi import FFI
-
-ffibuilder = FFI()
-# arch = "%s-%s" % (os.uname().sysname, os.uname().machine)
-uname = platform.uname()
-
-
-if uname.system == "Windows":
-    if struct.calcsize("P") * 8 == 64:
-        libdir = "./lib64"
-    else:
-        libdir = "./lib32"
-elif uname.system == "Darwin":
-    if uname.machine == "x86_64":
-        libdir = "/Users/runner/work/_temp/install/lib"
-    else:
-        libdir = "/usr/local/lib"
-else:
-    libdir = "/usr/local/lib"
-
-
-ffibuilder.set_source(
-    "curl_cffi._wrapper",
-    """
-        #include "shim.h"
-    """,
-    libraries=["curl-impersonate-chrome"] if uname.system != "Windows" else ["libcurl"],
-    library_dirs=[libdir],
-    source_extension=".c",
-    include_dirs=[
-        os.path.join(os.path.dirname(__file__), "include"),
-        os.path.join(os.path.dirname(__file__), "ffi"),
-    ],
-    sources=[
-        os.path.join(os.path.dirname(__file__), "ffi/shim.c"),
-    ],
-    extra_compile_args=(
-        ["-Wno-implicit-function-declaration"] if uname.system == "Darwin" else []
-    ),
-    # extra_link_args=["-Wl,-rpath,$ORIGIN/../libcurl/" + arch],
-)
-
-with open(os.path.join(os.path.dirname(__file__), "ffi/cdef.c")) as f:
-    cdef_content = f.read()
-    ffibuilder.cdef(cdef_content)
-
-
-if __name__ == "__main__":
-    ffibuilder.compile(verbose=False)
diff --git a/curl_cffi/ffi/cdef.c b/ffi/cdef.c
similarity index 100%
rename from curl_cffi/ffi/cdef.c
rename to ffi/cdef.c
diff --git a/curl_cffi/ffi/shim.c b/ffi/shim.c
similarity index 100%
rename from curl_cffi/ffi/shim.c
rename to ffi/shim.c
diff --git a/curl_cffi/ffi/shim.h b/ffi/shim.h
similarity index 100%
rename from curl_cffi/ffi/shim.h
rename to ffi/shim.h
diff --git a/pyproject.toml b/pyproject.toml
index 3acc24a3..cc170e2c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -71,7 +71,6 @@ test = [
 [tool.setuptools]
 packages = ["curl_cffi", "curl_cffi.requests"]
 package-data = { curl_cffi = ["libcurl.dll"] }
-# include-package-data = true
 
 
 [build-system]
@@ -104,9 +103,6 @@ archs = ["auto", "aarch64"]
 [tool.cibuildwheel.macos]
 before-all = "gmake preprocess"
 
-[tool.isort]
-profile = "black"
-
 [tool.ruff.lint]
 # Enable the isort rules.
 extend-select = ["I"]
diff --git a/scripts/build.py b/scripts/build.py
new file mode 100644
index 00000000..016107d0
--- /dev/null
+++ b/scripts/build.py
@@ -0,0 +1,79 @@
+import os
+import platform
+import struct
+
+from cffi import FFI
+
+
+def abs_machine():
+    machine = platform.machine()
+
+    pointer_bits = struct.calcsize("P") * 8
+    if pointer_bits not in (32, 64):
+        raise Exception("Unsupported pointer size")
+
+    is_64 = pointer_bits == 64
+
+    # x86 based archs
+    if machine in ('AMD64', 'x86_64', 'i686'):
+        return "x86_64" if is_64 else "i686"
+    # arm based archs
+    elif machine in ('aarch64', 'arm64', 'armv6l', 'armv7l'):
+        return "aarch64" if is_64 else "arm"
+    else:
+        raise Exception("Unsupported processor")
+
+
+ffibuilder = FFI()
+system = platform.system()
+machine = abs_machine()
+parent_dir = os.path.dirname(os.path.dirname(__file__))
+
+if system == "Windows":
+    if machine == "x86_64":
+        libdir = "./lib32"
+    elif machine == "i686":
+        libdir = "./lib64"
+    else:
+        libdir = "ERROR"
+elif system == "Darwin":
+    if machine == "x86_64":
+        libdir = "/Users/runner/work/_temp/install/lib"
+    else:
+        libdir = "ERROR"
+else:
+    if machine in ("x86_64", "arm", "aarch64"):
+        libdir = "/usr/local/lib"
+    else:
+        libdir = "ERROR"
+
+if libdir == "ERROR":
+    raise Exception("Unsupported platform")
+
+ffibuilder.set_source(
+    "curl_cffi._wrapper",
+    """
+        #include "shim.h"
+    """,
+    libraries=["curl-impersonate-chrome"] if system != "Windows" else ["libcurl"],
+    library_dirs=[libdir],
+    source_extension=".c",
+    include_dirs=[
+        os.path.join(parent_dir, "include"),
+        os.path.join(parent_dir, "ffi"),
+    ],
+    sources=[
+        os.path.join(parent_dir, "ffi/shim.c"),
+    ],
+    extra_compile_args=(
+        ["-Wno-implicit-function-declaration"] if system == "Darwin" else []
+    ),
+)
+
+with open(os.path.join(parent_dir, "ffi/cdef.c")) as f:
+    cdef_content = f.read()
+    ffibuilder.cdef(cdef_content)
+
+
+if __name__ == "__main__":
+    ffibuilder.compile(verbose=False)
diff --git a/setup.py b/setup.py
index e2ce8e23..32553873 100644
--- a/setup.py
+++ b/setup.py
@@ -1,3 +1,4 @@
+import sys
 import os
 import platform
 import shutil
@@ -23,33 +24,58 @@ def get_tag(self):
         return python, abi, plat
 
 
-def download_so():
-    uname = platform.uname()
-    machine = uname.machine
+def abs_machine():
+    machine = platform.machine()
+
+    pointer_bits = struct.calcsize("P") * 8
+    if pointer_bits not in (32, 64):
+        raise Exception("Unsupported pointer size")
+
+    is_64 = pointer_bits == 64
+
+    # x86 based archs
+    if machine in ('AMD64', 'x86_64', 'i686'):
+        return "x86_64" if is_64 else "i686"
+    # arm based archs
+    elif machine in ('aarch64', 'arm64', 'armv6l', 'armv7l'):
+        return "aarch64" if is_64 else "arm"
+    else:
+        raise Exception("Unsupported processor")
+
 
-    # do not download if target platfrom dll not found
+def download_so():
+    system = platform.system()
+    machine = abs_machine()
 
-    if uname.system == "Windows":
+    if system == "Windows":
         sysname = "win32"
-        if struct.calcsize("P") * 8 == 64:
-            machine = "x86_64"
+        so_name = "libcurl.dll"
+
+        if machine == "x86_64":
+            libdir = "./lib32"
+        elif machine == "i686":
             libdir = "./lib64"
         else:
-            machine = "i686"
-            libdir = "./lib32"
-        so_name = "libcurl.dll"
-    elif uname.system == "Darwin":
+            so_name = "SKIP"
+
+    elif system == "Darwin":
         sysname = "macos"
-        libdir = "/Users/runner/work/_temp/install/lib"
+        so_name = "libcurl-impersonate-chrome.4.dylib"
+
         if machine == "x86_64":
-            so_name = "libcurl-impersonate-chrome.4.dylib"
+            libdir = "/Users/runner/work/_temp/install/lib"
         else:
             so_name = "SKIP"
+
     else:
         sysname = "linux-gnu"
-        libdir = "/usr/local/lib"
         so_name = "libcurl-impersonate-chrome.so"
 
+        if machine in ("x86_64", "arm", "aarch64"):
+            libdir = "/usr/local/lib"
+        else:
+            so_name = "SKIP"
+
     if so_name == "SKIP":
         print(".so file for platform is not available on github.")
         return
@@ -57,6 +83,7 @@ def download_so():
     if (Path(libdir) / so_name).exists():
         print(".so files alreay downloaded.")
         return
+
     file = "libcurl-impersonate.tar.gz"
     url = (
         f"https://github.com/yifeikong/curl-impersonate/releases/download/"
@@ -70,7 +97,8 @@ def download_so():
     print("Unpacking downloaded files...")
     os.makedirs(libdir, exist_ok=True)
     shutil.unpack_archive(file, libdir)
-    if uname.system == "Windows":
+
+    if system == "Windows":
         shutil.copy2(f"{libdir}/libcurl.dll", "curl_cffi")
 
 
@@ -80,11 +108,15 @@ def run(self):
         super().run()
 
 
+# this option is only valid in setup.py
+kwargs = {"cffi_modules": ["scripts/build.py:ffibuilder"]}
+if len(sys.argv) > 1 and sys.argv[1] != 'bdist_wheel':
+    kwargs = {}
+
 setup(
-    # this option is only valid in setup.py
-    cffi_modules=["curl_cffi/build.py:ffibuilder"],
     cmdclass={
         "bdist_wheel": bdist_wheel_abi3,  # type: ignore
         "build": my_build,  # type: ignore
     },
+    **kwargs,
 )