Index: thunar-vfs-sysdep.c
===================================================================
--- thunar-vfs-sysdep.c	(revision 17603)
+++ thunar-vfs-sysdep.c	(working copy)
@@ -72,7 +72,7 @@
                             struct dirent **result,
                             GError        **error)
 {
-#ifndef HAVE_READDIR_R
+#if !defined(HAVE_READDIR_R) || defined(__sgi__)
   G_LOCK_DEFINE_STATIC (readdir);
 #endif
 
@@ -83,7 +83,7 @@
 
   for (;;)
     {
-#ifdef HAVE_READDIR_R
+#if defined(HAVE_READDIR_R) && !defined(__sgi__)
       if (G_UNLIKELY (readdir_r (dirp, entry, result) < 0))
         {
           g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),