diff --git a/doc/source/conf.py b/doc/source/conf.py

index e59a4382b..83fa388e8 100644

--- a/doc/source/conf.py

+++ b/doc/source/conf.py

@@ -106,7 +106,7 @@ release = version

 # non-false value, then it is used:

 #today = ''

 # Else, today_fmt is used as the format for a strftime call.

-#today_fmt = '%B %d, %Y'

+today_fmt = '%B %d, %Y'

 # List of documents that shouldn't be included in the build.

 #unused_docs = []

@@ -227,11 +227,11 @@ html_static_path = ['_static']

 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,

 # using the given strftime format.

-#html_last_updated_fmt = '%b %d, %Y'

+html_last_updated_fmt = '%b %d, %Y'

 # If true, SmartyPants will be used to convert quotes and dashes to

 # typographically correct entities.

-#html_use_smartypants = True

+html_use_smartypants = True

 # Custom sidebar templates, maps document names to template names.

 html_sidebars = {

@@ -249,7 +249,7 @@ html_sidebars = {

 #html_use_modindex = True

 # If false, no index is generated.

-#html_use_index = True

+html_use_index = True

 # If true, the index is split into individual pages for each letter.

 #html_split_index = False

@@ -266,7 +266,7 @@ html_sidebars = {

 # If true, an OpenSearch description file will be output, and all pages will

 # contain a <link> tag referring to it.  The value of this option must be the

 # base URL from which the finished HTML is served.

-#html_use_opensearch = ''

+html_use_opensearch = 'objects.inv'

 # If nonempty, this is the file name suffix for HTML files (e.g. ".xhtml").

 #html_file_suffix = ''

diff --git a/skimage/draw/setup.py b/skimage/draw/setup.py

index 6e0cb1b51..f53e65a5e 100644

--- a/skimage/draw/setup.py

+++ b/skimage/draw/setup.py

@@ -13,7 +13,7 @@ def configuration(parent_package='', top_path=None):

     cython(['_draw.pyx'], working_path=base_path)

-    config.add_extension('_draw', sources=['_draw.c'],

+    config.add_extension('_draw', sources=['_draw.c'], libraries=['m'],

                          include_dirs=[get_numpy_include_dirs(), '../_shared'])

     return config

diff --git a/skimage/feature/setup.py b/skimage/feature/setup.py

index 868eebd26..ceaec48c2 100755

--- a/skimage/feature/setup.py

+++ b/skimage/feature/setup.py

@@ -26,16 +26,17 @@ def configuration(parent_package='', top_path=None):

     config.add_extension('_cascade', sources=['_cascade.cpp'],

                          include_dirs=[get_numpy_include_dirs()],

+                         libraries=['m'],

                          language="c++")

     config.add_extension('corner_cy', sources=['corner_cy.c'],

                          include_dirs=[get_numpy_include_dirs()])

     config.add_extension('censure_cy', sources=['censure_cy.c'],

                          include_dirs=[get_numpy_include_dirs()])

-    config.add_extension('orb_cy', sources=['orb_cy.c'],

+    config.add_extension('orb_cy', sources=['orb_cy.c'], libraries=['m'],

                          include_dirs=[get_numpy_include_dirs()])

     config.add_extension('brief_cy', sources=['brief_cy.c'],

                          include_dirs=[get_numpy_include_dirs()])

-    config.add_extension('_texture', sources=['_texture.c'],

+    config.add_extension('_texture', sources=['_texture.c'], libraries=['m'],

                          include_dirs=[get_numpy_include_dirs(), '../_shared'])

     config.add_extension('_hessian_det_appx', sources=['_hessian_det_appx.c'],

                          include_dirs=[get_numpy_include_dirs()])

diff --git a/skimage/filters/setup.py b/skimage/filters/setup.py

index e3aed4b0d..0ed434c39 100644

--- a/skimage/filters/setup.py

+++ b/skimage/filters/setup.py

@@ -21,7 +21,7 @@ def configuration(parent_package='', top_path=None):

                          include_dirs=[get_numpy_include_dirs()])

     config.add_extension('_multiotsu', sources=['_multiotsu.c'],

                          include_dirs=[get_numpy_include_dirs()])

-    config.add_extension('rank.generic_cy', sources=['rank/generic_cy.c'],

+    config.add_extension('rank.generic_cy', sources=['rank/generic_cy.c'], libraries=['m'],

                          include_dirs=[get_numpy_include_dirs()])

     config.add_extension(

         'rank.percentile_cy', sources=['rank/percentile_cy.c'],

diff --git a/skimage/io/setup.py b/skimage/io/setup.py

index a16512b02..171a88d6f 100644

--- a/skimage/io/setup.py

+++ b/skimage/io/setup.py

@@ -19,7 +19,7 @@ def configuration(parent_package='', top_path=None):

            working_path=base_path)

     config.add_extension('_plugins._colormixer',

-                         sources=['_plugins/_colormixer.c'],

+                         sources=['_plugins/_colormixer.c'], libraries=['m'],

                          include_dirs=[get_numpy_include_dirs()])

     config.add_extension('_plugins._histograms',

diff --git a/skimage/measure/setup.py b/skimage/measure/setup.py

index 4ef48285c..07f7563db 100644

--- a/skimage/measure/setup.py

+++ b/skimage/measure/setup.py

@@ -22,7 +22,7 @@ def configuration(parent_package='', top_path=None):

                          include_dirs=[get_numpy_include_dirs()])

     config.add_extension('_find_contours_cy', sources=['_find_contours_cy.c'],

                          include_dirs=[get_numpy_include_dirs()])

-    config.add_extension('_moments_cy', sources=['_moments_cy.c'],

+    config.add_extension('_moments_cy', sources=['_moments_cy.c'], libraries=['m'],

                          include_dirs=[get_numpy_include_dirs()])

     config.add_extension('_marching_cubes_classic_cy',

                          sources=['_marching_cubes_classic_cy.c'],

diff --git a/skimage/restoration/setup.py b/skimage/restoration/setup.py

index fcc2598e5..813d6f9c0 100644

--- a/skimage/restoration/setup.py

+++ b/skimage/restoration/setup.py

@@ -26,10 +26,11 @@ def configuration(parent_package='', top_path=None):

     unwrap_sources_3d = ['_unwrap_3d.c', 'unwrap_3d_ljmu.c']

     config.add_extension('_unwrap_3d', sources=unwrap_sources_3d,

                          include_dirs=[get_numpy_include_dirs()])

-    config.add_extension('_denoise_cy', sources=['_denoise_cy.c'],

+    config.add_extension('_denoise_cy', sources=['_denoise_cy.c'], libraries=['m'],

                          include_dirs=[get_numpy_include_dirs()])

     config.add_extension('_nl_means_denoising',

                          sources=['_nl_means_denoising.c'],

+                         libraries=['m'],

                          include_dirs=[get_numpy_include_dirs(),

                                        '../_shared'])

diff --git a/skimage/segmentation/setup.py b/skimage/segmentation/setup.py

index 01e54ac20..3392e11d1 100644

--- a/skimage/segmentation/setup.py

+++ b/skimage/segmentation/setup.py

@@ -21,6 +21,7 @@ def configuration(parent_package='', top_path=None):

     config.add_extension('_felzenszwalb_cy', sources=['_felzenszwalb_cy.c'],

                          include_dirs=[get_numpy_include_dirs()])

     config.add_extension('_quickshift_cy', sources=['_quickshift_cy.c'],

+                         libraries=['m'],

                          include_dirs=[get_numpy_include_dirs()])

     config.add_extension('_slic', sources=['_slic.c'],

                          include_dirs=[get_numpy_include_dirs()])

diff --git a/skimage/transform/setup.py b/skimage/transform/setup.py

index eae7604d1..5045e4c77 100644

--- a/skimage/transform/setup.py

+++ b/skimage/transform/setup.py

@@ -16,14 +16,14 @@ def configuration(parent_package='', top_path=None):

             '_warps_cy.pyx',

             '_radon_transform.pyx'], working_path=base_path)

-    config.add_extension('_hough_transform', sources=['_hough_transform.c'],

+    config.add_extension('_hough_transform', sources=['_hough_transform.c'], libraries=['m'],

                          include_dirs=[get_numpy_include_dirs()])

-    config.add_extension('_warps_cy', sources=['_warps_cy.c'],

+    config.add_extension('_warps_cy', sources=['_warps_cy.c'], libraries=['m'],

                          include_dirs=[get_numpy_include_dirs(), '../_shared'])

     config.add_extension('_radon_transform',

-                         sources=['_radon_transform.c'],

+                         sources=['_radon_transform.c'], libraries=['m'],

                          include_dirs=[get_numpy_include_dirs()])

     return config