BUILD: add libm onlyon posix systems

sklearn/tree/setup.py

+import os
+
 import numpy
 from numpy.distutils.misc_util import Configuration
 
 
 def configuration(parent_package="", top_path=None):
     config = Configuration("tree", parent_package, top_path)
+    libraries = []
+    if os.name == 'posix':
+        libraries.append('m')
     config.add_extension("_tree",
                          sources=["_tree.c"],
                          include_dirs=[numpy.get_include()],
-                         libraries=['m'])
+                         libraries=libraries)
 
     config.add_subpackage("tests")
 

sklearn/utils/setup.py

+import os
 from os.path import join
+
 from numpy.distutils.system_info import get_info
 
 
@@ -19,12 +21,17 @@ def configuration(parent_package='', top_path=None):
     else:
         cblas_libs = blas_info.pop('libraries', [])
 
+    libraries = []
+    if os.name == 'posix':
+        libraries.append('m')
+        cblas_libs.append('m')
+
     config.add_extension('arraybuilder',
          sources=['arraybuilder.c'])
 
     config.add_extension('sparsefuncs',
          sources=['sparsefuncs.c'],
-         libraries=['m'])
+         libraries=libraries)
 
     config.add_extension('arrayfuncs',
          sources=['arrayfuncs.c'],
@@ -53,7 +60,7 @@ def configuration(parent_package='', top_path=None):
     config.add_extension('weight_vector',
          sources=['weight_vector.c'],
          include_dirs=[numpy.get_include()],
-         libraries=['m'])
+         libraries=libraries)
 
     return config