[Python] poetry shows as "no such file or directory" in Makefile, but works fine in terminal

I am experimenting with using the CPython C API and managing dependencies (e.g. setuptools) via poetry.

To compile my code I wrote a Makefile looking something like this:

PYTHON = poetry run python

build: setup.py ...some C extension files...
$(PYTHON) setup.py build_ext
$(PYTHON) setup.py build_ext -i


The problem is that when I go to run it, I get this:

$ make
poetry run python setup.py build_ext
make: poetry: No such file or directory
make: *** [build] Error 1


Even weirder:

$ type poetry
poetry is /Users/rusty/.local/bin/poetry
$ which poetry
$ echo $?
1


I thought that which and type would return the exact same results.

I checked my $PATH and it contains the directory ~/.local/bin (not /Users/rusty/.local/bin, literally ~/.local/bin in case that helps) (where pypoetry is installed) twice.

I am on macOS 15.3.2.

Please don't give me suggestions like "don't use poetry".

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