diff -r 738de9a9a3ea Lib/distutils/_msvccompiler.py
--- a/Lib/distutils/_msvccompiler.py	Thu Aug 20 11:13:09 2015 +1200
+++ b/Lib/distutils/_msvccompiler.py	Fri Aug 21 12:39:58 2015 -0500
@@ -468,7 +468,7 @@
     # ccompiler.py.
 
     def library_dir_option(self, dir):
-        return "/LIBPATH:" + dir
+        return "/LIBPATH:" + dir.rstrip('\\')
 
     def runtime_library_dir_option(self, dir):
         raise DistutilsPlatformError(
diff -r 738de9a9a3ea Lib/distutils/msvc9compiler.py
--- a/Lib/distutils/msvc9compiler.py	Thu Aug 20 11:13:09 2015 +1200
+++ b/Lib/distutils/msvc9compiler.py	Fri Aug 21 12:39:58 2015 -0500
@@ -740,7 +740,7 @@
     # ccompiler.py.
 
     def library_dir_option(self, dir):
-        return "/LIBPATH:" + dir
+        return "/LIBPATH:" + dir.rstrip('\\')
 
     def runtime_library_dir_option(self, dir):
         raise DistutilsPlatformError(
diff -r 738de9a9a3ea Lib/distutils/msvccompiler.py
--- a/Lib/distutils/msvccompiler.py	Thu Aug 20 11:13:09 2015 +1200
+++ b/Lib/distutils/msvccompiler.py	Fri Aug 21 12:39:58 2015 -0500
@@ -534,7 +534,7 @@
     # ccompiler.py.
 
     def library_dir_option(self, dir):
-        return "/LIBPATH:" + dir
+        return "/LIBPATH:" + dir.rstrip('\\')
 
     def runtime_library_dir_option(self, dir):
         raise DistutilsPlatformError(