diff -urN a/Lib/distutils/cygwinccompiler.py b/Lib/distutils/cygwinccompiler.py
--- a/Lib/distutils/cygwinccompiler.py	2014-10-11 14:20:36.095798400 +0100
+++ b/Lib/distutils/cygwinccompiler.py	2014-10-11 14:20:39.245978600 +0100
@@ -93,6 +93,7 @@
     obj_extension = ".o"
     static_lib_extension = ".a"
     shared_lib_extension = ".dll"
+    dylib_lib_extension = ".dll.a"
     static_lib_format = "lib%s%s"
     shared_lib_format = "%s%s"
     exe_extension = ".exe"