$NetBSD: patch-bj,v 1.4 2009/02/15 09:43:38 wiz Exp $

--- src/file_convert.c.orig	2009-01-18 05:52:32.000000000 +0000
+++ src/file_convert.c
@@ -668,7 +668,11 @@ static void conversion_prefs_changed (Co
     conv->max_threads_num = prefs_get_int (FILE_CONVERT_MAX_THREADS_NUM);
     if (conv->max_threads_num == 0)
     {   /* set to maximum available number of processors */
+#if defined(_SC_NPROCESSORS_ONLN) && !defined(__DragonFly__)
 	conv->max_threads_num = sysconf (_SC_NPROCESSORS_ONLN);
+#else
+	conv->max_threads_num = 1;
+#endif
 	/* paranoia mode on */
 	if (conv->max_threads_num <= 0)
 	{