Issue #13194: zlib.compressobj().copy() and zlib.decompressobj().copy() are now available on Windows.
diff --git a/PC/pyconfig.h b/PC/pyconfig.h
index cbddbd8..138d8fa 100644
--- a/PC/pyconfig.h
+++ b/PC/pyconfig.h
@@ -648,6 +648,9 @@
 #define HAVE_WCSXFRM 1
 #endif
 
+/* Define if the zlib library has inflateCopy */
+#define HAVE_ZLIB_COPY 1
+
 /* Define if you have the <dlfcn.h> header file.  */
 /* #undef HAVE_DLFCN_H */