diff -rupN Python-2.7.13/setup.py Python-2.7.13-new/setup.py
--- Python-2.7.13/setup.py	2017-01-21 01:46:12.895539343 +0100
+++ Python-2.7.13-new/setup.py	2017-01-21 01:46:12.897539322 +0100
@@ -393,7 +393,7 @@ class PyBuildExt(build_ext):
         # Debian/Ubuntu multiarch support.
         # https://wiki.ubuntu.com/MultiarchSpec
         cc = sysconfig.get_config_var('CC')
-        tmpfile = os.path.join(self.build_temp, 'multiarch')
+        tmpfile = os.path.join(self.build_temp, 'multiarch').replace('\\','/')
         if not os.path.exists(self.build_temp):
             os.makedirs(self.build_temp)
         ret = os.system(
@@ -418,7 +418,7 @@ class PyBuildExt(build_ext):
         opt = ''
         if cross_compiling:
             opt = '-t' + sysconfig.get_config_var('HOST_GNU_TYPE')
-        tmpfile = os.path.join(self.build_temp, 'multiarch')
+        tmpfile = os.path.join(self.build_temp, 'multiarch').replace('\\','/')
         if not os.path.exists(self.build_temp):
             os.makedirs(self.build_temp)
         ret = os.system(
@@ -437,7 +437,7 @@ class PyBuildExt(build_ext):
 
     def add_gcc_paths(self):
         gcc = sysconfig.get_config_var('CC')
-        tmpfile = os.path.join(self.build_temp, 'gccpaths')
+        tmpfile = os.path.join(self.build_temp, 'gccpaths').replace('\\','/')
         if not os.path.exists(self.build_temp):
             os.makedirs(self.build_temp)
         ret = os.system('%s -E -v - </dev/null 2>%s 1>/dev/null' % (gcc, tmpfile))
@@ -895,7 +895,7 @@ class PyBuildExt(build_ext):
         opensslv_h = find_file('openssl/opensslv.h', [],
                 inc_dirs + search_for_ssl_incs_in)
         if opensslv_h:
-            name = os.path.join(opensslv_h[0], 'openssl/opensslv.h')
+            name = os.path.join(opensslv_h[0], 'openssl/opensslv.h').replace('\\','/')
             if host_platform == 'darwin' and is_macosx_sdk_path(name):
                 name = os.path.join(macosx_sdk_root(), name[1:])
             try:
@@ -1924,9 +1924,9 @@ class PyBuildExt(build_ext):
         archs = re.findall('-arch\s+(\w+)', cflags)
 
         if is_macosx_sdk_path(F):
-            fp = os.popen("file %s/Tk.framework/Tk | grep 'for architecture'"%(os.path.join(sysroot, F[1:]),))
+            fp = os.popen("file %s/Tk.framework/Tk | grep 'for architecture'"%(os.path.join(sysroot, F[1:]).replace('\\','/'),))
         else:
-            fp = os.popen("file %s/Tk.framework/Tk | grep 'for architecture'"%(F,))
+            fp = os.popen("file %s/Tk.framework/Tk | grep 'for architecture'"%(F.replace('\\','/'),))
 
         detected_archs = []
         for ln in fp: