Issue 1:
Code Sample, a copy-pastable example if possible

% grep -2 '^\(FAIL\|ERROR\|[^ ]*Error:\)' pandas_0.18.1+git25-ga7469cf-1~nd90+1_i386.build

======================================================================
ERROR: test_groupby (pandas.tests.test_categorical.TestCategoricalAsBlock)
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Traceback (most recent call last):
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File "/build/pandas-0.18.1+git25-ga7469cf/debian/tmp/usr/lib/python2.7/dist-packages/pandas/core/groupby.py", line 4433, in _groupby_indices
counts = np.bincount(codes[mask], minlength=values.categories.size)
TypeError: Cannot cast array data from dtype('int64') to dtype('int32') according to the rule 'safe'

======================================================================
ERROR: test_get_group_empty_bins (pandas.tests.test_groupby.TestGroupBy)
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Traceback (most recent call last):
--
File "/build/pandas-0.18.1+git25-ga7469cf/debian/tmp/usr/lib/python2.7/dist-packages/pandas/core/groupby.py", line 4433, in _groupby_indices
counts = np.bincount(codes[mask], minlength=values.categories.size)
TypeError: Cannot cast array data from dtype('int64') to dtype('int32') according to the rule 'safe'

======================================================================
FAIL: test_nat (pandas.tseries.tests.test_base.TestDatetimeIndexOps)
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Traceback (most recent call last):
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File "/build/pandas-0.18.1+git25-ga7469cf/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 1018, in raise_assert_detail
raise AssertionError(msg)
AssertionError: numpy array are different

Attribute "dtype" are different
--
======================================================================
FAIL: test_nat (pandas.tseries.tests.test_base.TestPeriodIndexOps)
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Traceback (most recent call last):
--
File "/build/pandas-0.18.1+git25-ga7469cf/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 1018, in raise_assert_detail
raise AssertionError(msg)
AssertionError: numpy array are different

Attribute "dtype" are different
--
======================================================================
FAIL: test_nat (pandas.tseries.tests.test_base.TestTimedeltaIndexOps)
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Traceback (most recent call last):
--
File "/build/pandas-0.18.1+git25-ga7469cf/debian/tmp/usr/lib/python2.7/dist-packages/pandas/util/testing.py", line 1018, in raise_assert_detail
raise AssertionError(msg)
AssertionError: numpy array are different

Attribute "dtype" are different
--
Ran 10942 tests in 1071.084s

FAILED (SKIP=284, errors=2, failures=3)
True
WHAT THE

output of pd.show_versions()

all the versions and more info is in the full build log: http://neuro.debian.net/_files/_buildlogs/pandas/0.18.1+git25-ga7469cf/pandas_0.18.1+git25-ga7469cf-1_amd64.build but altogether versions are close/the same as in #14269 (comment)

Issue 2:
A bunch of tests are failing in the wheel-building repo (https://github.com/MacPython/pandas-wheels): https://travis-ci.org/MacPython/pandas-wheels/builds/158414872

It are mainly issues with 32 bit linux (see eg https://travis-ci.org/MacPython/pandas-wheels/jobs/158414875), but also some tests are failing for 64bit:

On 2.7:

======================================================================
FAIL: test_abs (pandas.tests.test_panel4d.TestPanel4d)
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Traceback (most recent call last):
File "/venv/local/lib/python2.7/site-packages/pandas/tests/test_panel4d.py", line 303, in test_abs
assert_frame_equal(result, expected)
File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
self.gen.next()
File "/venv/local/lib/python2.7/site-packages/pandas/util/testing.py", line 2538, in assert_produces_warning
% extra_warnings)
AssertionError: Caused unexpected warning(s): ['RuntimeWarning', 'RuntimeWarning', 'RuntimeWarning'].

On 3.5:

======================================================================
FAIL: test_pi_ops_errors (pandas.tseries.tests.test_period.TestPeriodIndexSeriesMethods)
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Traceback (most recent call last):
File "/venv/lib/python3.5/site-packages/pandas/tseries/tests/test_period.py", line 4184, in test_pi_ops_errors
np.add(ng, obj)
File "/venv/lib/python3.5/site-packages/pandas/util/testing.py", line 2450, in __exit__
raise AssertionError("{0} not raised.".format(name))
AssertionError: TypeError not raised.
======================================================================

FAIL: test_pi_sub_period (pandas.tseries.tests.test_period.TestPeriodIndexSeriesMethods)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/venv/lib/python3.5/site-packages/pandas/tseries/tests/test_period.py", line 4299, in test_pi_sub_period
tm.assert_index_equal(result, exp)
File "/venv/lib/python3.5/site-packages/pandas/util/testing.py", line 756, in assert_index_equal
assertIsInstance(left, Index, '[index] ')
File "/venv/lib/python3.5/site-packages/pandas/util/testing.py", line 947, in assertIsInstance
raise AssertionError(err_msg.format(msg, cls, type(obj)))
AssertionError: [index] Expected type <class 'pandas.indexes.base.Index'>, found <class 'NotImplementedType'> instead

I can't directly reproduce, but that last one is possibly an issue with the numpy version