Error compiling skimage with memoryviews

 ~/projects/skimage (3d-slic)$ python setup.py install
non-existing path in 'skimage/_shared': 'tests'
cython -o /Volumes/Projects/skimage/skimage/segmentation/_slic.c /Volumes/Projects/skimage/skimage/segmentation/_slic.pyx

Error compiling Cython file:
------------------------------------------------------------
...
                 float ratio, int max_iter, int n_segments):
    """Helper function for SLIC segmentation."""

    # initialize on grid:
    cdef Py_ssize_t depth, height, width
    shape = image_zyx.shape
                    ^
------------------------------------------------------------

skimage/segmentation/_slic.pyx:25:21: Cannot convert 'Py_ssize_t [8]' to Python object

Error compiling Cython file:
------------------------------------------------------------
...
    n_means = means.shape[0]
    cdef Py_ssize_t i, k, x, y, z, x_min, x_max, y_min, y_max, z_min, z_max, \
            changes
    cdef double dist_mean

    cdef cnp.float_t* image_p = <cnp.float_t*> image_zyx.data
                               ^
------------------------------------------------------------

skimage/segmentation/_slic.pyx:40:32: Casting temporary Python object to non-numeric non-Python type

Error compiling Cython file:
------------------------------------------------------------
...
    n_means = means.shape[0]
    cdef Py_ssize_t i, k, x, y, z, x_min, x_max, y_min, y_max, z_min, z_max, \
            changes
    cdef double dist_mean

    cdef cnp.float_t* image_p = <cnp.float_t*> image_zyx.data
                               ^
------------------------------------------------------------

skimage/segmentation/_slic.pyx:40:32: Python objects cannot be cast to pointers of primitive types

Error compiling Cython file:
------------------------------------------------------------
...
    cdef Py_ssize_t i, k, x, y, z, x_min, x_max, y_min, y_max, z_min, z_max, \
            changes
    cdef double dist_mean

    cdef cnp.float_t* image_p = <cnp.float_t*> image_zyx.data
    cdef cnp.float_t* distance_p = <cnp.float_t*> distance.data
                                  ^
------------------------------------------------------------

skimage/segmentation/_slic.pyx:41:35: Casting temporary Python object to non-numeric non-Python type

Error compiling Cython file:
------------------------------------------------------------
...
    cdef Py_ssize_t i, k, x, y, z, x_min, x_max, y_min, y_max, z_min, z_max, \
            changes
    cdef double dist_mean

    cdef cnp.float_t* image_p = <cnp.float_t*> image_zyx.data
    cdef cnp.float_t* distance_p = <cnp.float_t*> distance.data
                                  ^
------------------------------------------------------------

skimage/segmentation/_slic.pyx:41:35: Python objects cannot be cast to pointers of primitive types

Error compiling Cython file:
------------------------------------------------------------
...
    cdef cnp.float_t* current_pixel
    cdef double tmp
    for i in range(max_iter):
        distance.fill(np.inf)
        changes = 0
        current_mean = <cnp.float_t*> means.data
                      ^
------------------------------------------------------------

skimage/segmentation/_slic.pyx:48:23: Casting temporary Python object to non-numeric non-Python type

Error compiling Cython file:
------------------------------------------------------------
...
    cdef cnp.float_t* current_pixel
    cdef double tmp
    for i in range(max_iter):
        distance.fill(np.inf)
        changes = 0
        current_mean = <cnp.float_t*> means.data
                      ^
------------------------------------------------------------

skimage/segmentation/_slic.pyx:48:23: Python objects cannot be cast to pointers of primitive types