+#undef HAVE_LIBDL
+
+/* Define if you have the mingwex library. */
+#undef HAVE_MINGWEX
+
+/* Define if struct msghdr contains msg_accrights field */
+#undef HAVE_MSGHDR_MSG_ACCRIGHTS
+
+/* Define if struct msghdr contains msg_control field */
+#undef HAVE_MSGHDR_MSG_CONTROL
+
+/* Define if RTLD_GLOBAL is available */
+#undef HAVE_RTLDGLOBAL
+
+/* Define if RTLD_LOCAL is available */
+#undef HAVE_RTLDLOCAL
+
+/* Define if we can see RTLD_NEXT in dlfcn.h */
+#undef HAVE_RTLDNEXT
+
+/* Define if we can see RTLD_NOW in dlfcn.h */
+#undef HAVE_RTLDNOW
+
+/* Define if usleep returns void */
+#undef USLEEP_RETURNS_VOID
+
+/* Define if it looks like a Linux sendfile(2) implementation */
+#undef HAVE_LINUX_SENDFILE
+
+/* Define if it looks like a BSDish sendfile(2) implementation */
+#undef HAVE_BSD_SENDFILE