+/* 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
+