$NetBSD: patch-ad,v 1.2.24.1 2009/03/03 19:57:53 tron Exp $
diff -ru optipng-0.6.2/src/optipng.c optipng-0.6.2.1/src/optipng.c
--- src/optipng.c	2008-11-09 23:56:00.000000000 -0500
+++ src/optipng.c	2008-11-11 13:57:00.000000000 -0500
@@ -542,6 +542,7 @@
 static void
 app_init(void)
 {
+    setvbuf(stdout, NULL, _IONBF, 0);
     if (options.log_name != NULL)
     {
         /* Open the log file, line-buffered. */
