Apply by doing:
       cd /usr/src
       patch -p0 < 019_ftpd.patch
       cd libexec/ftpd
       make obj && make depend && make && make install

Index: libexec/ftpd/ftpd.c
===================================================================
RCS file: /cvs/src/libexec/ftpd/ftpd.c,v
retrieving revision 1.71
diff -u -r1.71 ftpd.c
--- libexec/ftpd/ftpd.c 2000/04/29 14:02:59     1.71
+++ libexec/ftpd/ftpd.c 2000/07/05 22:06:23
@@ -135,7 +135,7 @@
#include <varargs.h>
#endif

-static char version[] = "Version 6.4/OpenBSD";
+static char version[] = "Version 6.5/OpenBSD";

extern off_t restart_point;
extern char cbuf[];
@@ -1011,7 +1011,7 @@
                   "%s: anonymous/%.*s", remotehost,
                   (int)(sizeof(proctitle) - sizeof(remotehost) -
                   sizeof(": anonymous/")), passwd);
-               setproctitle(proctitle);
+               setproctitle("%s", proctitle);
#endif /* HASSETPROCTITLE */
               if (logging)
                       syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
@@ -1021,7 +1021,7 @@
#ifdef HASSETPROCTITLE
               snprintf(proctitle, sizeof(proctitle),
                   "%s: %s", remotehost, pw->pw_name);
-               setproctitle(proctitle);
+               setproctitle("%s", proctitle);
#endif /* HASSETPROCTITLE */
               if (logging)
                       syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
@@ -2009,7 +2009,7 @@
       remotehost[sizeof(remotehost)-1] = '\0';
#ifdef HASSETPROCTITLE
       snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
-       setproctitle(proctitle);
+       setproctitle("%s", proctitle);
#endif /* HASSETPROCTITLE */

       if (logging)