Ludovic Courtès <ludo@gnu.org> writes:

>> +          'install 'wrap-program
>> +          (lambda* (#:key outputs #:allow-other-keys)
>> +            (let ((out (assoc-ref %outputs "out"))
>> +                  (path (getenv "PYTHONPATH")))
>> +              (wrap-program (string-append out "/bin/idr")
>> +                `("PYTHONPATH" ":" prefix (,path))))
>
> Taking $PYTHONPATH as is has the effect of keeping a reference to Cython
> and to setuptools, which may not be what you want, given that they are
> listed as ‘native-inputs’.
>
> Should it instead explicitly list SciPy, NumPy, and Matplotlib?

You are right.  Is the attached patch better?