diff -Naur a/Lib/distutils/unixccompiler.py b/Lib/distutils/unixccompiler.py
--- a/Lib/distutils/unixccompiler.py	2014-05-31 22:58:38.000000000 +0400
+++ b/Lib/distutils/unixccompiler.py	2014-06-04 10:16:50.483800000 +0400
@@ -82,6 +82,7 @@
     static_lib_format = shared_lib_format = dylib_lib_format = "lib%s%s"
     if sys.platform == "cygwin":
         exe_extension = ".exe"
+        dylib_lib_extension = ".dll.a"
 
     def preprocess(self, source,
                    output_file=None, macros=None, include_dirs=None,