Problem compiling Cython file

[caitlinch]

I'm having issues installing TIGGER. The issue is with compiling the Cython file.
I’ve cloned the github:

cd ~/Documents/Executables/
git clone https://github.com/brettc/tigger.git
cd tigger

Then I tried to install:

caitlinch$ python setup.py install
Compiling tigger/_bounce.pyx because it changed.
[1/1] Cythonizing tigger/_bounce.pyx

Error compiling Cython file:
------------------------------------------------------------
...
# distutils: include_dirs = NUMPY_PATH
^
------------------------------------------------------------

tigger/_bounce.pyx:1:0: 'tigger/_bounce' is not a valid module name
Traceback (most recent call last):
  File "setup.py", line 22, in <module>
    ext_modules=cythonize(
  File "/Users/caitlincherryh/opt/anaconda3/lib/python3.8/site-packages/Cython/Build/Dependencies.py", line 1102, in cythonize
    cythonize_one(*args)
  File "/Users/caitlincherryh/opt/anaconda3/lib/python3.8/site-packages/Cython/Build/Dependencies.py", line 1225, in cythonize_one
    raise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: tigger/_bounce.pyx

It looks like something to do with the dependencies to me, but I don't have enough experience with Cython/compiling programs to troubleshoot.