Upstream no longer supports utmp...
http://git.savannah.gnu.org/cgit/nmh.git/patch/?id=7ba29497ff3f164e2a507eda35e81f1cb0658c74

Backout recent breakage...
http://git.savannah.gnu.org/cgit/nmh.git/patch/?id=6443ed24f6c3b41186636a0b0fea93ebe9452047


Index: uip/rcvtty.c
--- uip/rcvtty.c.orig
+++ uip/rcvtty.c
@@ -36,6 +36,8 @@
 
 #ifdef HAVE_GETUTXENT
 #include <utmpx.h>
+#else
+#include <utmp.h>
 #endif /* HAVE_GETUTXENT */
 
 #define	SCANFMT	\
@@ -77,9 +79,7 @@ static char *format = NULL;
 static void alrmser (int);
 static int message_fd (char **);
 static int header_fd (void);
-#if HAVE_GETUTXENT
 static void alert (char *, int);
-#endif /* HAVE_GETUTXENT */
 
 
 int
@@ -88,7 +88,12 @@ main (int argc, char **argv)
     int md, vecp = 0;
     char *cp, *user, buf[BUFSIZ];
     char **argp, **arguments, *vec[MAXARGS];
+#if HAVE_GETUTXENT
     struct utmpx *utp;
+#else
+    struct utmp ut;
+    register FILE *uf;
+#endif
 
     if (nmh_init(argv[0], true, false)) { return 1; }
 
@@ -169,7 +174,14 @@ main (int argc, char **argv)
     }
     endutxent();
 #else
-    NMH_UNUSED (utp);
+    if ((uf = fopen(_PATH_UTMP, "r")) == NULL)
+       exit(1);
+    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) {
+           alert(ut.ut_line, md);
+       }
+    fclose (uf);
 #endif /* HAVE_GETUTXENT */
 
     exit(0);
@@ -290,7 +302,6 @@ header_fd (void)
 }
 
 
-#if HAVE_GETUTXENT
 static void
 alert (char *tty, int md)
 {
@@ -327,4 +338,3 @@ alert (char *tty, int md)
 
     close (td);
 }
-#endif /* HAVE_GETUTXENT */