diff -rupN Python-2.7.13/Lib/distutils/cygwinccompiler.py Python-2.7.13-new/Lib/distutils/cygwinccompiler.py
--- Python-2.7.13/Lib/distutils/cygwinccompiler.py	2017-01-21 01:46:08.431587003 +0100
+++ Python-2.7.13-new/Lib/distutils/cygwinccompiler.py	2017-01-21 01:46:08.432586992 +0100
@@ -85,6 +85,7 @@ class CygwinCCompiler (UnixCCompiler):
     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"