diff -up ./common/toolcommon/pstdout.c.vaty ./common/toolcommon/pstdout.c
--- ./common/toolcommon/pstdout.c.vaty	2013-05-30 16:04:27.461099744 +0200
+++ ./common/toolcommon/pstdout.c	2013-05-30 16:04:36.516115447 +0200
@@ -761,12 +761,12 @@ pstdout_vprintf(pstdout_state_t pstate,
       return -1;
     }
 
-  if (!ap)
+/*  if (!ap)
     {
       pstdout_errnum = PSTDOUT_ERR_PARAMETERS;
       return -1;
     }
-
+*/
   rv = _pstdout_print(pstate, 0, stdout, format, ap);
   return rv;
 }