$NetBSD$
--- vm/threadinfo.c.orig	2004-03-03 19:21:00.000000000 +0000
+++ vm/threadinfo.c	2004-03-03 19:21:16.000000000 +0000
@@ -57,8 +57,10 @@
   pthread_mutexattr_t kind;
 
   pthread_mutexattr_init(&kind);
+#if __linux__
   pthread_mutexattr_setkind_np(&kind, PTHREAD_MUTEX_RECURSIVE_NP);
 #endif
+#endif
 
   if (nnode == NULL) {
     return NULL;
