[Python] How to include header file in source distribution?

I am trying to create a source distribution containing a simple c function. Here are the files I have.

# file setup.py
from setuptools import setup

setup(
name="example",
version="0.1",
py_modules=["example", "build"], # If i dont include build.py, it will not find it.
cffi_modules=["build.py:ffibuilder"],
install_requires=["cffi"],
setup_requires=["cffi"],
)


# file "build.py"

from cffi import FFI

ffibuilder = FFI()

SOURCE = """
#include "factorial.h"
"""

ffibuilder.cdef(
"""
long long int factorial(int n);
"""
)

ffibuilder.set_source(
module_name="_example",
source=SOURCE,
sources=["factorial.c"],
include_dirs=["."],
library_dirs=["."],
)

if __name__ == "__main__":
ffibuilder.compile(verbose=True)


// file "factorial.c"
#include "factorial.h"

long long int factorial(int n)
{
long long int result = 1;
int i;
for (i = 1; i <= n; i++)
result *= i;
return result;
}


// file "factorial.h"
long long int factorial(int n);


With these files I run the command

python setup.py sdist


Which generates the file "dist\example-0.1.tar.gz". And when I try to install it using

pip install example-0.1.tar.gz


I get

build\temp.win-amd64-3.9\Release\_example.c(570): fatal error C1083: Cannot open include file: 'factorial.h': No such file or directory


So how do I include the header file in the source distribtuion?

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