diff --git a/src/ca/ucx.h b/src/ca/ucx.h
new file mode 100644
index 000000000..deadb06cd
--- /dev/null
+++ b/src/ca/ucx.h
@@ -0,0 +1,63 @@
+/* 
+ *
+ *	U C X . H
+ *	UNIX ioctl structures and defines used for VAX/UCX
+ *      Author: Gerhard Grygiel (GeG)
+ *
+ *      GeG	09-DEC-1992	initial edit
+ *
+ */
+#ifndef _UCX_H_
+#define _UCX_H_ 
+#ifdef UCX
+
+#define	IFF_UP		0x1		/* interface is up */
+#define	IFF_BROADCAST	0x2		/* broadcast address valid */
+#define	IFF_LOOPBACK	0x8		/* is a loopback net */
+/*
+ * Interface request structure used for socket
+ * ioctl's.  All interface ioctl's must have parameter
+ * definitions which begin with ifr_name.  The
+ * remainder may be interface specific.
+ */
+struct	ifreq {
+#define	IFNAMSIZ	16
+	char	ifr_name[IFNAMSIZ];		/* if name, e.g. "en0" */
+	union {
+		struct	sockaddr ifru_addr;
+		struct	sockaddr ifru_dstaddr;
+		struct	sockaddr ifru_broadaddr;
+		short	ifru_flags;
+		int	ifru_metric;
+		caddr_t	ifru_data;
+	} ifr_ifru;
+#define	ifr_addr	ifr_ifru.ifru_addr	/* address */
+#define	ifr_dstaddr	ifr_ifru.ifru_dstaddr	/* other end of p-to-p link */
+#define	ifr_broadaddr	ifr_ifru.ifru_broadaddr	/* broadcast address */
+#define	ifr_flags	ifr_ifru.ifru_flags	/* flags */
+#define ifr_metric	ifr_ifru.ifru_metric	/* metric */
+#define	ifr_data	ifr_ifru.ifru_data	/* for use by interface */
+};
+
+/* Structure used in SIOCGIFCONF request.
+ * Used to retrieve interface configuration
+ * for machine (useful for programs which
+ * must know all networks accessible).
+ */
+struct	ifconf {
+	int	ifc_len;		/* size of associated buffer */
+	union {
+		caddr_t	ifcu_buf;
+		struct	ifreq *ifcu_req;
+	} ifc_ifcu;
+#define	ifc_buf	ifc_ifcu.ifcu_buf	/* buffer address */
+#define	ifc_req	ifc_ifcu.ifcu_req	/* array of structures returned */
+};
+
+
+#include <iodef.h>
+#define IO$_RECEIVE	(IO$_WRITEVBLK)
+
+#endif
+#endif
+