Missing include, probably due to jgroff-0.99 being based on groff-1.9
initially.
$OpenBSD: patch-hpftodit_hpftodit_cc,v 1.1.1.1 2000/04/12 20:34:11 espie Exp $
--- hpftodit/hpftodit.cc.orig	Tue Apr 11 23:05:43 2000
+++ hpftodit/hpftodit.cc	Tue Apr 11 23:05:55 2000
@@ -34,6 +34,7 @@ put filename in error messages (or fix l
 #include <string.h>
 #include <errno.h>
 #include "assert.h"
+#include "eucmac.h"
 #include "lib.h"
 #include "posix.h"
 #include "errarg.h"