--- authrhosts.c.orig	2016-10-10 13:51:34.924228986 +0200
+++ authrhosts.c	2016-10-10 13:51:37.359228942 +0200
@@ -24,11 +24,16 @@
 {
 	USED(tx);
 
+#ifdef __GLIBC__
 	if(ruserok(remotehostname, 0, rx->uname, rx->uname) < 0){
 		fprint(2, "ruserok(%s, %s) not okay\n", remotehostname, rx->uname);
 		return "u9fs: rhosts authentication failed";
 	}
 	return 0;
+#else
+	USED(rx);
+	return "u9fs: rhosts authentication failed";
+#endif
 }
 
 Auth authrhosts = {
