TypeError: 'NoneType' object is not callable
When running the 0.18.1 self tests with python-3.5.2 on NetBSD, I see a couple of test failures. One is tracked in #12337, here's the log for the others:

```

======================================================================
ERROR: test_secondary_kde (pandas.tseries.tests.test_plotting.TestTSPlot)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tseries/tests/test_plotting.py", line 611, in test_secondary_kde
    ax = ser.plot(secondary_y=True, kind='density')
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3566, in __call__
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2645, in plot_series
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_df_legend_labels (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 2675, in test_df_legend_labels
    ax = df.plot(kind=kind, legend=True)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3740, in __call__
    sort_columns=sort_columns, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2614, in plot_frame
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_kde_colors (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3020, in test_kde_colors
    ax = df.plot.kde(color=custom_colors)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3855, in kde
    return self(kind='kde', **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3740, in __call__
    sort_columns=sort_columns, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2614, in plot_frame
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_kde_colors_and_styles_subplots (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3043, in test_kde_colors_and_styles_subplots
    axes = df.plot(kind='kde', subplots=True)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3740, in __call__
    sort_columns=sort_columns, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2614, in plot_frame
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_kde_df (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 2491, in test_kde_df
    ax = _check_plot_works(df.plot, kind='kde')
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3982, in _check_plot_works
    ret = f(**kwargs)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3740, in __call__
    sort_columns=sort_columns, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2614, in plot_frame
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_kde_missing_vals (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 2512, in test_kde_missing_vals
    _check_plot_works(df.plot, kind='kde')
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3982, in _check_plot_works
    ret = f(**kwargs)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3740, in __call__
    sort_columns=sort_columns, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2614, in plot_frame
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_kind_both_ways (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3186, in test_kind_both_ways
    df.plot(kind=kind)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3740, in __call__
    sort_columns=sort_columns, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2614, in plot_frame
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_memory_leak (pandas.tests.test_graphics.TestDataFramePlots)
Check that every plot type gets properly collected.
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3647, in test_memory_leak
    results[kind] = weakref.proxy(df.plot(kind=kind, **args))
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3740, in __call__
    sort_columns=sort_columns, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2614, in plot_frame
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_no_legend (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 2765, in test_no_legend
    ax = df.plot(kind=kind, legend=False)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3740, in __call__
    sort_columns=sort_columns, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2614, in plot_frame
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_plot (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 1322, in test_plot
    df.plot.line(blarg=True)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3760, in line
    return self(kind='line', x=x, y=y, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3740, in __call__
    sort_columns=sort_columns, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2614, in plot_frame
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1707, in _make_plot
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1722, in _plot
    lines = MPLPlot._plot(ax, x, y_values, style=style, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1342, in _plot
    return ax.plot(*args, **kwds)
  File "/usr/pkg/lib/python3.5/site-packages/matplotlib/__init__.py", line 1819, in inner
    return func(ax, *args, **kwargs)
  File "/usr/pkg/lib/python3.5/site-packages/matplotlib/axes/_axes.py", line 1382, in plot
    for line in self._get_lines(*args, **kwargs):
  File "/usr/pkg/lib/python3.5/site-packages/matplotlib/axes/_base.py", line 381, in _grab_next_args
    for seg in self._plot_args(remaining, kwargs):
  File "/usr/pkg/lib/python3.5/site-packages/matplotlib/axes/_base.py", line 369, in _plot_args
    seg = func(x[:, j % ncx], y[:, j % ncy], kw, kwargs)
  File "/usr/pkg/lib/python3.5/site-packages/matplotlib/axes/_base.py", line 276, in _makeline
    seg = mlines.Line2D(x, y, **kw)
  File "/usr/pkg/lib/python3.5/site-packages/matplotlib/lines.py", line 380, in __init__
    self.update(kwargs)
  File "/usr/pkg/lib/python3.5/site-packages/matplotlib/artist.py", line 859, in update
    raise AttributeError('Unknown property %s' % k)
AttributeError: Unknown property blarg

======================================================================
ERROR: test_hist_kde (pandas.tests.test_graphics.TestSeriesPlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 1023, in test_hist_kde
    _check_plot_works(self.ts.plot.kde)
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3982, in _check_plot_works
    ret = f(**kwargs)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3671, in kde
    return self(kind='kde', **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3566, in __call__
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2645, in plot_series
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_hist_kde_color (pandas.tests.test_graphics.TestSeriesPlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 1078, in test_hist_kde_color
    ax = self.ts.plot.kde(logy=True, color='r')
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3671, in kde
    return self(kind='kde', **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3566, in __call__
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2645, in plot_series
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_kde_kwargs (pandas.tests.test_graphics.TestSeriesPlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 1038, in test_kde_kwargs
    ind=linspace(-100, 100, 20))
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3982, in _check_plot_works
    ret = f(**kwargs)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3671, in kde
    return self(kind='kde', **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3566, in __call__
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2645, in plot_series
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_kde_missing_vals (pandas.tests.test_graphics.TestSeriesPlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 1052, in test_kde_missing_vals
    _check_plot_works(s.plot.kde)
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3982, in _check_plot_works
    ret = f(**kwargs)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3671, in kde
    return self(kind='kde', **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3566, in __call__
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2645, in plot_series
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_kind_both_ways (pandas.tests.test_graphics.TestSeriesPlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 1099, in test_kind_both_ways
    s.plot(kind=kind)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3566, in __call__
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2645, in plot_series
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_plot (pandas.tests.test_graphics.TestSeriesPlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 557, in test_plot
    _check_plot_works(self.series[:5].plot, kind=kind)
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3982, in _check_plot_works
    ret = f(**kwargs)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3566, in __call__
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2645, in plot_series
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_series_grid_settings (pandas.tests.test_graphics.TestSeriesPlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 1193, in test_series_grid_settings
    plotting._common_kinds)
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 480, in _check_grid_settings
    obj.plot(kind=kind, **kws)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3566, in __call__
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2645, in plot_series
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_valid_object_plot (pandas.tests.test_graphics.TestSeriesPlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 1117, in test_valid_object_plot
    _check_plot_works(s.plot, kind=kind)
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3982, in _check_plot_works
    ret = f(**kwargs)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 3566, in __call__
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2645, in plot_series
    **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2441, in _plot
    plot_obj.generate()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 1028, in generate
    self._make_plot()
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2073, in _make_plot
    stacking_id=stacking_id, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 2127, in _plot
    gkde = gaussian_kde(y, bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

======================================================================
ERROR: test_scatter_plot_legacy (pandas.tests.test_graphics_others.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../pandas-0.18.1/pandas/tests/test_graphics_others.py", line 408, in test_scatter_plot_legacy
    _check_plot_works(scat, diagonal='kde')
  File ".../pandas-0.18.1/pandas/tests/test_graphics.py", line 3982, in _check_plot_works
    ret = f(**kwargs)
  File ".../pandas-0.18.1/pandas/tests/test_graphics_others.py", line 402, in scat
    return plotting.scatter_matrix(df, **kwds)
  File ".../pandas-0.18.1/pandas/tools/plotting.py", line 370, in scatter_matrix
    gkde = gaussian_kde(y)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 171, in __init__
    self.set_bandwidth(bw_method=bw_method)
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 498, in set_bandwidth
    self._compute_covariance()
  File "/usr/pkg/lib/python3.5/site-packages/scipy/stats/kde.py", line 513, in _compute_covariance
    self._norm_factor = sqrt(linalg.det(2*pi*self.covariance)) * self.n
  File "/usr/pkg/lib/python3.5/site-packages/scipy/linalg/basic.py", line 747, in det
    a_det, info = fdet(a1, overwrite_a=overwrite_a)
TypeError: 'NoneType' object is not callable

----------------------------------------------------------------------
Ran 10272 tests in 1498.940s

FAILED (errors=20, skipped=572)
```

Any ideas what could cause this? Missing dependency, missing support in libc, something else?
