diff --git a/src/acconfig.h b/src/acconfig.h
index cc8ac8b320d241537d5878e3f9bbbf3ee34d4033..f02d067ffb613375bffec79b49bd69ddde802bd6 100644
--- a/src/acconfig.h
+++ b/src/acconfig.h
@@ -1,5 +1,5 @@
 /*
- * $Id: acconfig.h,v 1.101 2002/06/25 14:26:39 grubba Exp $
+ * $Id: acconfig.h,v 1.102 2002/09/03 09:46:45 grubba Exp $
  */
 #ifndef MACHINE_H
 #define MACHINE_H
@@ -468,6 +468,14 @@
 #undef DL_EXPORT
 #undef USE_MY_WIN32_DLOPEN
 
+/* CygWin kludge. */
+#if defined(HAVE_UNISTD_H) && defined(HAVE_WINDOWS_H)
+#undef HAVE_WINDOWS_H
+#undef HAVE_WINBASE_H
+#undef HAVE_WINSOCK_H
+#undef HAVE_WINSOCK2_H
+#endif /* HAVE_SYS_UNISTD_H && HAVE_WINDOWS_H */
+
 /* How to set a socket non-blocking */
 #undef USE_IOCTL_FIONBIO
 #undef USE_IOCTLSOCKET_FIONBIO