Library:
    Extension: _nd_image
        Sources: src/nd_image.c,
                 src/ni_filters.c,
                 src/ni_fourier.c,
                 src/ni_interpolation.c,
                 src/ni_measure.c,
                 src/ni_morphology.c,
                 src/ni_support.c
    Extension: _ni_label
        Sources: src/_ni_label.c
