Hello Felix, > + (native-inputs > + (list python-cython python-hypothesis python-pytest > + python-pytest-xdist gfortran)) What about using something like: --8<---------------cut here---------------start------------->8--- (native-inputs (modify-inputs (package-inputs python-numpy-next) (delete "python-hypothesis") (prepend python-hypothesis))) --8<---------------cut here---------------end--------------->8--- not to duplicate the native-inputs list? Thanks, Mathieu