--- out_str.c	Mon Apr 15 14:51:05 2002
+++ out_str.c.new	Fri Oct 10 09:57:12 2003
@@ -35,6 +35,10 @@
   size_t l;
   mp_exp_t e;
 
+  /* when stream=NULL, output to stdout */
+  if (stream == NULL)
+    stream = stdout;
+
   if (MPFR_IS_NAN(op))
     {
       fprintf (stream, "NaN");