diff --git a/CHANGES b/CHANGES
index 80ac1f2..7ddfcbe 100644
--- a/CHANGES
+++ b/CHANGES
@@ -100,6 +100,10 @@ Features:
 	confirm option ipv6-v6only).
 	Added option ai-passive to control this flag explicitely.
 
+	New option ai-v4mapped (v4mapped) sets or unsets the AI_V4MAPPED flag
+	of the resolver. For Socat addresses requiring IPv6 addresses, this
+	resolves IPv4 addresses to the approriate IPv6 address [::ffff:*:*].
+
 Corrections:
 	When a sub process (EXEC, SYSTEM) terminated with exit code other than
 	0, its last sent data might have been lost depending on timing of read/
diff --git a/VERSION b/VERSION
index 576e205..ceaf471 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-"1.7.4.5+conn-over"
+"1.7.4.5+"
diff --git a/doc/socat.yo b/doc/socat.yo
index 909fd77..cae5c97 100644
--- a/doc/socat.yo
+++ b/doc/socat.yo
@@ -2243,12 +2243,20 @@ dit(bf(tt(ip-transparent)))
 label(OPTION_AI_ADDRCONFIG)
 dit(bf(tt(ai-addrconfig[=0|1]))), dit(bf(tt(addrconfig[=0|1])))
    Sets or unsets the AI_ADDRCONFIG flag to prevent name resolution to address
-   families that are not configured (e.g. IPv6). Default value is 1 in case the
-   resolver does not get an address family hint from Socat address or defaults.
+   families that are not available on the computer (e.g. IPv6). Default value
+   is 1 in case the resolver does not get an address family hint from Socat
+   address or defaults.
+label(OPTION_AI_PASSIVE)
 dit(bf(tt(ai-passive[=0|1]))), dit(bf(tt(passive[=0|1])))
-   Sets of unsets the AI_ADDRCONFIG flag for code(getaddrinfo)) calls. Default
-   is 1 for LISTEN, RECV, and RECVFROM type addresses, and with
+   Sets of unsets the AI_ADDRCONFIG flag for code(getaddrinfo()) calls.
+   Default is 1 for LISTEN, RECV, and RECVFROM type addresses, and with
    link(bind)(OPTION_BIND) option. 
+label(OPTION_AI_V4MAPPED)
+dit(bf(tt(ai-v4mapped[=0|1]))), dit(bf(tt(v4mapped[=0|1])))
+   Sets or unsets the AI_V4MAPPED flag for code(getaddrinfo()). With socat()
+   addresses requiring IPv6 addresses, this resolves IPv4 addresses to the
+   approriate IPv6 address [::ffff:*:*]. For IPv6 Socat addresses, the default
+   is 1.
 label(OPTION_RES_DEBUG)dit(bf(tt(res-debug)))
 label(OPTION_RES_AAONLY)dit(bf(tt(res-aaonly)))
 label(OPTION_RES_USEVC)dit(bf(tt(res-usevc)))
diff --git a/xio-ip.c b/xio-ip.c
index fb6c1bc..b42ee56 100644
--- a/xio-ip.c
+++ b/xio-ip.c
@@ -83,6 +83,7 @@ const struct optdesc opt_ip_recvif = { "ip-recvif", "recvdstaddrif",OPT_IP_RECVI
 
 #ifdef AI_ADDRCONFIG
 const struct optdesc opt_ai_addrconfig = { "ai-addrconfig", "addrconfig", OPT_AI_ADDRCONFIG, GROUP_SOCK_IP, PH_INIT, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.socket.ip.ai_flags), XIO_SIZEOF(para.socket.ip.ai_flags), AI_ADDRCONFIG };
+const struct optdesc opt_ai_v4mapped   = { "ai-v4mapped",   "v4mapped",   OPT_AI_V4MAPPED,   GROUP_SOCK_IP, PH_INIT, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.socket.ip.ai_flags), XIO_SIZEOF(para.socket.ip.ai_flags), AI_V4MAPPED };
 #endif
 #ifdef AI_PASSIVE
 const struct optdesc opt_ai_passive    = { "ai-passive",    "passive",    OPT_AI_PASSIVE,    GROUP_SOCK_IP, PH_INIT, TYPE_BOOL, OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.socket.ip.ai_flags), XIO_SIZEOF(para.socket.ip.ai_flags), AI_PASSIVE    };
@@ -227,7 +228,6 @@ int xiogetaddrinfo(const char *node, const char *service,
    }
    if (family == 0)
       hints.ai_flags |= AI_ADDRCONFIG;
-   hints.ai_flags |= AI_PASSIVE 	/* important for IPv4+IPv6 listen */;
 #if HAVE_GETADDRINFO
    if (node != NULL || service != NULL) {
       struct addrinfo *record;
@@ -461,7 +461,6 @@ int xioresolve(const char *node, const char *service,
    if (ai_flags[0] & AI_PASSIVE && family == PF_UNSPEC) {
       /* We select the first IPv6 address, if available,
 	 because this might accept IPv4 connections too */
-      struct addrinfo *aip = res;
       while (aip != NULL) {
 	 if (aip->ai_family == PF_INET6)
 	    break;
diff --git a/xio-ip.h b/xio-ip.h
index 4c63f7a..9695ba9 100644
--- a/xio-ip.h
+++ b/xio-ip.h
@@ -31,6 +31,7 @@ extern const struct optdesc opt_ip_transparent;
 
 extern const struct optdesc opt_ai_addrconfig;
 extern const struct optdesc opt_ai_passive;
+extern const struct optdesc opt_ai_v4mapped;
 
 extern const struct optdesc opt_res_debug;
 extern const struct optdesc opt_res_aaonly;
diff --git a/xio-ipapp.c b/xio-ipapp.c
index 3c671da..ac71f2e 100644
--- a/xio-ipapp.c
+++ b/xio-ipapp.c
@@ -36,10 +36,9 @@ int xioopen_ipapp_connect(int argc, const char *argv[], struct opt *opts,
    bool needbind = false;
    bool lowport = false;
    int level;
-   int result;
-
    struct addrinfo **ai_sorted;
    int i;
+   int result;
 
    if (argc != 3) {
       Error2("%s: wrong number of parameters (%d instead of 2)", argv[0], argc-1);
diff --git a/xio-udp.c b/xio-udp.c
index a6e31b2..73f0dc8 100644
--- a/xio-udp.c
+++ b/xio-udp.c
@@ -354,7 +354,6 @@ int xioopen_udp_sendto(int argc, const char *argv[], struct opt *opts,
       return STAT_NORETRY;
    }
 
-   //xioinit_ip(&pf, xioparms.preferred_ip);
    retropt_socket_pf(opts, &pf);
    if ((result = _xioopen_udp_sendto(argv[1], argv[2], opts, xioflags, xfd,
 				     groups, pf, socktype, ipproto))
@@ -451,7 +450,6 @@ int xioopen_udp_datagram(int argc, const char *argv[], struct opt *opts,
       return STAT_NORETRY;
    }
 
-   //xioinit_ip(&pf, xioparms.preferred_ip);
    if ((hostname = strdup(argv[1])) == NULL) {
       Error1("strdup(\"%s\"): out of memory", argv[1]);
       return STAT_RETRYLATER;
@@ -601,7 +599,6 @@ int xioopen_udp_recv(int argc, const char *argv[], struct opt *opts,
       return STAT_NORETRY;
    }
 
-   //xioinit_ip(&pf, xioparms.default_ip);
    retropt_socket_pf(opts, &pf);
    if (pf == PF_UNSPEC) {
 #if WITH_IP4 && WITH_IP6
diff --git a/xioinitialize.c b/xioinitialize.c
index 6b7161a..813a4d9 100644
--- a/xioinitialize.c
+++ b/xioinitialize.c
@@ -72,7 +72,6 @@ int xioinitialize(void) {
    {
       const char *default_ip;
 
-      // xioparms.default_ip = WITH_DEFAULT_IPV;
       default_ip = getenv("SOCAT_DEFAULT_LISTEN_IP");
       if (default_ip != NULL) {
 	 switch (default_ip[0]) {
@@ -89,7 +88,6 @@ int xioinitialize(void) {
    {
       const char *preferred_ip;
 
-      // xioparms.preferred_ip = WITH_DEFAULT_IPV;
       preferred_ip = getenv("SOCAT_PREFERRED_RESOLVE_IP");
       if (preferred_ip != NULL) {
 	 switch (preferred_ip[0]) {
diff --git a/xioopen.c b/xioopen.c
index fa214af..e55baec 100644
--- a/xioopen.c
+++ b/xioopen.c
@@ -386,10 +386,6 @@ xiofile_t *xioopen(const char *addr,	/* address specification */
 		   int xioflags) {
    xiofile_t *xfd;
 
-   //if (xioinitialize() < 0) {
-   //   return NULL;
-   //}
-
    Debug1("xioopen(\"%s\")", addr);
 
    if ((xfd = xioparse_dual(&addr)) == NULL) {
diff --git a/xioopts.c b/xioopts.c
index 5a84ad5..3d1cc34 100644
--- a/xioopts.c
+++ b/xioopts.c
@@ -181,6 +181,9 @@ const struct optname optionnames[] = {
 #endif
 #if defined(AI_PASSIVE	)
 	IF_IP	  ("ai-passive", 		&opt_ai_passive)
+#endif
+#if defined(AI_V4MAPPED)
+	IF_IP	  ("ai-v4mapped", 		&opt_ai_v4mapped)
 #endif
 	IF_INTERFACE("allmulti",	&opt_iff_allmulti)
 #if WITH_LIBWRAP && defined(HAVE_HOSTS_ALLOW_TABLE)
@@ -1848,6 +1851,9 @@ const struct optname optionnames[] = {
 #if HAVE_RESOLV_H
 	IF_IP     ("usevc",	&opt_res_usevc)
 #endif /* HAVE_RESOLV_H */
+#if defined(AI_V4MAPPED)
+	IF_IP	  ("v4mapped", 		&opt_ai_v4mapped)
+#endif
 #ifdef IPV6_V6ONLY
 	IF_IP6    ("v6only",	&opt_ipv6_v6only)
 #endif
diff --git a/xioopts.h b/xioopts.h
index 4a79218..b253ac5 100644
--- a/xioopts.h
+++ b/xioopts.h
@@ -204,6 +204,7 @@ enum e_optcode {
    OPT_ADDRESS_FAMILY = 1,
    OPT_AI_ADDRCONFIG, 	/* getaddrinfo() */
    OPT_AI_PASSIVE, 	/* getaddrinfo() */
+   OPT_AI_V4MAPPED, 	/* getaddrinfo() */
    /* these are not alphabetically, I know... */
    OPT_B0,		/* termios.c_cflag */
    OPT_B50,		/* termios.c_cflag */