As built the op port generates a bunch of noisy output on stderr as it parses it's config file. I think this is debugging output for the op programmer. It makes the port less useful especially if the data on your tty was important before you ran op.

Fix: Substitute this patch-lex.l for the on that ships with the port:

# cat files/patch-lex.l


#include <stdio.h>
-#include <varargs.h>
+#include <stdarg.h>
 #include <ctype.h>
 #include "defs.h"

+static int     addarg();
 static cmd_t   *newcmd();
 char   *savestr();

@@ -47,15 +48,12 @@
 #include <sys/stat.h>
 #include <syslog.h>

-msg(va_alist)
- va_dcl
+msg(char *s,...)
 {
 #if 0
        va_list ap;
-       char    *s;

-       va_start(ap);
-       s = va_arg(ap, char *);
+       va_start(ap,s);
        fprintf(stderr,"line %d: ",yyline);
        vfprintf(stderr, s, ap);
        fputc('\n', stderr);--ouXtyuzNmw3wfAklh0O5cGpziiwv2hrTWvjZKkX2GKmMCwJd
Content-Type: text/plain; name="file.diff"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="file.diff"

--- lex.l.orig  Sun Jan 16 11:36:55 2005
+++ lex.l       Sun Jan 16 13:09:52 2005
@@ -10,10 +10,11 @@
 /* +-------------------------------------------------------------------+ */
How-To-Repeat:       Build the op port. Configure it and run it.