As of 1.5, upstream no longer supported utmp:

http://git.savannah.gnu.org/cgit/nmh.git/patch/?id=7ba29497ff3f164e2a507eda35e81f1cb0658c74

Without utmp support (or utmpx in openbsd), rcvtty(1) will not notify
the terminal upon receipt of new mail... which is why it exists.

We still want rcvtty to work, so bring the utmp support back as a local
patch.

ok bentley@

mail/nmh/Makefile

@@ -1,8 +1,9 @@
-# $OpenBSD: Makefile,v 1.33 2012/06/18 16:03:00 pascal Exp $
+# $OpenBSD: Makefile,v 1.34 2013/01/02 04:19:54 william Exp $
 
 COMMENT=		new MH mail handling program
 
 DISTNAME=		nmh-1.5
+REVISION=		0
 CATEGORIES=		mail
 MASTER_SITES=		${MASTER_SITE_SAVANNAH:=nmh/}
 HOMEPAGE=		http://www.nongnu.org/nmh/

mail/nmh/patches/patch-uip_rcvtty_c

@@ -0,0 +1,47 @@
+$OpenBSD: patch-uip_rcvtty_c,v 1.1 2013/01/02 04:19:55 william Exp $
+
+Upstream no longer supports utmp...
+http://git.savannah.gnu.org/cgit/nmh.git/patch/?id=7ba29497ff3f164e2a507eda35e81f1cb0658c74
+
+
+--- uip/rcvtty.c.orig	Mon Jun 11 00:06:19 2012
++++ uip/rcvtty.c	Tue Jan  1 18:11:37 2013
+@@ -24,6 +24,8 @@
+ 
+ #ifdef HAVE_GETUTXENT
+ #include <utmpx.h>
++#else
++#include <utmp.h>
+ #endif /* HAVE_GETUTXENT */
+ 
+ #define	SCANFMT	\
+@@ -83,7 +85,12 @@ main (int argc, char **argv)
+     int md, vecp = 0;
+     char *cp, *user, buf[BUFSIZ], tty[BUFSIZ];
+     char **argp, **arguments, *vec[MAXARGS];
++#if HAVE_GETUTXENT
+     struct utmpx *utp;
++#else
++    struct utmp ut;
++    register FILE *uf;
++#endif
+ #ifdef LOCALE
+     setlocale(LC_ALL, "");
+ #endif
+@@ -169,6 +176,16 @@ main (int argc, char **argv)
+         }
+     }
+     endutxent();
++#else
++    if ((uf = fopen (_PATH_UTMP, "r")) == NULL)
++       exit (RCV_MBX);
++    while (fread ((char *) &ut, sizeof(ut), 1, uf) == 1)
++       if (ut.ut_name[0] != 0
++               && strncmp (user, ut.ut_name, sizeof(ut.ut_name)) == 0) {
++           strncpy (tty, ut.ut_line, sizeof(ut.ut_line));
++           alert (tty, md);
++       }
++    fclose (uf);
+ #endif /* HAVE_GETUTXENT */
+ 
+     exit (RCV_MOK);