Cannot make Cython work

Need some help to make cython work.

Trying to convert this simple Fibonacci program:
```
import timeit

def fib(n):
if n <= 1:
return max(n,0)
else:
return fib(n-1)+fib(n-2)

print("fib(10)", fib(10))
t = timeit.timeit(lambda: fib(10), number=100000)
print(t)
```

I’m using this shell command:

```cython —embed -3 fib.py```

and obtain the file `fib.c` that must be compiled.

After some search I can find the include folder of Python3.9 and try to compile with this command:

```clang -I /private/var/containers/Bundle/Application/E160CFBA-CB49-4E82-AAA2-4DED2E15E11B/a-Shell.app/Library/include/python3.9/ fib.c```

But this is the result:

```
In file included from fib.c:4:
In file included from /private/var/containers/Bundle/Application/E160CFBA-CB49-4E82-AAA2-4DED2E15E11B/a-Shell.app/Library/include/python3.9/Python.h:75:
/private/var/containers/Bundle/Application/E160CFBA-CB49-4E82-AAA2-4DED2E15E11B/a-Shell.app/Library/include/python3.9/pyport.h:741:2: error: "LONG_BIT
definition appears wrong for platform (bad gcc/glibc config?)."
#error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
^
In file included from fib.c:4:
In file included from /private/var/containers/Bundle/Application/E160CFBA-CB49-4E82-AAA2-4DED2E15E11B/a-Shell.app/Library/include/python3.9/Python.h:148:
/private/var/containers/Bundle/Application/E160CFBA-CB49-4E82-AAA2-4DED2E15E11B/a-Shell.app/Library/include/python3.9/pythread.h:128:13: fatal error:
'pthread.h' file not found
# include
^~~~~~~~~~~
2 errors generated.
```

Need some help to go further, pls!