diff -Naur Python-3.5.0-orig/setup.py Python-3.5.0/setup.py
--- Python-3.5.0-orig/setup.py	2015-09-21 13:42:33.399096000 +0300
+++ Python-3.5.0/setup.py	2015-09-21 13:42:33.531165600 +0300
@@ -404,7 +404,7 @@
         # 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(
@@ -429,7 +429,7 @@
         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(
@@ -448,7 +448,7 @@
 
     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))
@@ -714,7 +714,7 @@
         readline_termcap_library = ""
         curses_library = ""
         # Cannot use os.popen here in py3k.
-        tmpfile = os.path.join(self.build_temp, 'readline_termcap_lib')
+        tmpfile = os.path.join(self.build_temp, 'readline_termcap_lib').replace('\\','/')
         if not os.path.exists(self.build_temp):
             os.makedirs(self.build_temp)
         # Determine if readline is already linked against curses or tinfo.
@@ -859,7 +859,7 @@
         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:
@@ -1742,16 +1742,16 @@
         cflags = sysconfig.get_config_vars('CFLAGS')[0]
         archs = re.findall('-arch\s+(\w+)', cflags)
 
-        tmpfile = os.path.join(self.build_temp, 'tk.arch')
+        tmpfile = os.path.join(self.build_temp, 'tk.arch').replace('\\','/')
         if not os.path.exists(self.build_temp):
             os.makedirs(self.build_temp)
 
         # Note: cannot use os.popen or subprocess here, that
         # requires extensions that are not available here.
         if is_macosx_sdk_path(F):
-            os.system("file %s/Tk.framework/Tk | grep 'for architecture' > %s"%(os.path.join(sysroot, F[1:]), tmpfile))
+            os.system("file %s/Tk.framework/Tk | grep 'for architecture' > %s"%(os.path.join(sysroot, F[1:]).replace('\\','/'), tmpfile))
         else:
-            os.system("file %s/Tk.framework/Tk | grep 'for architecture' > %s"%(F, tmpfile))
+            os.system("file %s/Tk.framework/Tk | grep 'for architecture' > %s"%(F.replace('\\','/'), tmpfile))
 
         with open(tmpfile) as fp:
             detected_archs = []