diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 39dc500a..afa67eea 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -10,6 +10,18 @@ on:
       - bugfix/*
       - feature/*
 jobs:
+  sdist:
+    name: build sdist wheel
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: |
+          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: ${{ matrix.os }}
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 00000000..74e6a1e3
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,6 @@
+recursive-include tests/*
+
+include ffi/*
+include preprocess/*
+include scripts/build.py
+include Makefile
diff --git a/build.py b/scripts/build.py
similarity index 79%
rename from build.py
rename to scripts/build.py
index 67e047b5..27e9f5da 100644
--- a/build.py
+++ b/scripts/build.py
@@ -23,19 +23,19 @@
     ],
     source_extension=".c",
     include_dirs=[
-        os.path.join(os.path.dirname(__file__), "include"),
-        os.path.join(os.path.dirname(__file__), "ffi"),
+        "../include",
+        "../ffi",
     ],
     sources=[
-        os.path.join(os.path.dirname(__file__), "ffi/shim.c"),
+        "../ffi/shim.c",
     ],
     extra_compile_args=(
         ["-Wno-implicit-function-declaration"] if uname.system == "Darwin" else []
     ),
     # extra_link_args=["-Wl,-rpath,$ORIGIN/../libcurl/" + arch],
 )
-
-with open(os.path.join(os.path.dirname(__file__), "ffi/cdef.c")) as f:
+print(os.listdir('..'))
+with open("../ffi/cdef.c") as f:
     cdef_content = f.read()
     ffibuilder.cdef(cdef_content)
 
diff --git a/setup.py b/setup.py
index 31735d54..7abe81e0 100644
--- a/setup.py
+++ b/setup.py
@@ -1,3 +1,4 @@
+import sys
 from setuptools import setup
 from wheel.bdist_wheel import bdist_wheel
 
@@ -13,8 +14,14 @@ def get_tag(self):
         return python, abi, plat
 
 
+# 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 = {}
+
+print(sys.argv, kwargs)
+
 setup(
-    # this option is only valid in setup.py
-    cffi_modules=["./build.py:ffibuilder"],
     cmdclass={"bdist_wheel": bdist_wheel_abi3},  # type: ignore
+    **kwargs,
 )