@@ -, +, @@ 
---
--- a/CHANGES	
+++ a/CHANGES	
@@ -12,6 +12,10 @@ corrections:
 	cross compiling.
 	Thanks to Max Freisinger from Gentoo for seinding a patch.
 
+	Socat still depended on obsolete gethostbyname() function, thus
+	compiling with MUSL libc failed.
+	Problem reported by Kennedy33.
+
 testing:
 	test.sh: Show a warning when phase-1 (insecure phase) of a security
 	test fails
--- a/config.h.in	
+++ a/config.h.in	
@@ -99,6 +99,9 @@ 
 /* Define if you have the nanosleep function.  */
 #undef HAVE_NANOSLEEP
 
+/* Define if you have the gethostbyname function.  */
+#undef HAVE_GETHOSTBYNAME
+
 /* Define if you have the getaddrinfo function.  */
 #undef HAVE_GETADDRINFO
 
--- a/configure.in	
+++ a/configure.in	
@@ -740,7 +740,7 @@ AC_FUNC_MEMCMP
 AC_TYPE_SIGNAL
 AC_FUNC_STRFTIME
 AC_CHECK_FUNCS(putenv select poll socket strtod strtol)
-AC_CHECK_FUNCS(strtoul uname getpgid getsid getaddrinfo)
+AC_CHECK_FUNCS(strtoul uname getpgid getsid gethostbyname getaddrinfo)
 AC_CHECK_FUNCS(setgroups inet_aton)
 AC_CHECK_FUNCS()
 
--- a/sycls.c	
+++ a/sycls.c	
@@ -1364,7 +1364,7 @@ int Pause(void) {
    return retval;
 }
 
-#if WITH_IP4 || WITH_IP6
+#if ( _WITH_IP4 || _WITH_IP6 ) && HAVE_GETHOSTBYNAME
 struct hostent *Gethostbyname(const char *name) {
    struct hostent *hent;
    Debug1("gethostbyname(\"%s\")", name);
@@ -1380,7 +1380,7 @@ struct hostent *Gethostbyname(const char *name) {
    }
    return hent;
 }
-#endif /* WITH_IP4 || WITH_IP6 */
+#endif /* ( _WITH_IP4 || _WITH_IP6 ) && HAVE_GETHOSTBYNAME */
 
 #if (_WITH_IP4 || _WITH_IP6) && HAVE_GETADDRINFO
 int Getaddrinfo(const char *node, const char *service,
--- a/xio-ip4.c	
+++ a/xio-ip4.c	
@@ -15,12 +15,14 @@ 
 
 
 int xioparsenetwork_ip4(const char *rangename, struct xiorange *range) {
-   struct hostent *maskaddr;
    struct in_addr *netaddr_in = &range->netaddr.ip4.sin_addr;
    struct in_addr *netmask_in = &range->netmask.ip4.sin_addr;
    char *rangename1;	/* a copy of rangename with writing allowed */
    char *delimpos;	/* absolute address of delimiter */
    unsigned int bits;	/* netmask bits */
+   union sockaddr_union sau;
+   socklen_t socklen = sizeof(sau);
+   int rc;
 
    if ((rangename1 = strdup(rangename)) == NULL) {
       Error1("strdup(\"%s\"): out of memory", rangename);
@@ -43,31 +45,25 @@ int xioparsenetwork_ip4(const char *rangename, struct xiorange *range) {
 	 netmask_in->s_addr = htonl((0xffffffff << (32-bits)));
       }
    } else if (delimpos = strchr(rangename1, ':')) {
-      if ((maskaddr = Gethostbyname(delimpos+1)) == NULL) {
-	 /* note: cast is req on AIX: */
-	 Error2("gethostbyname(\"%s\"): %s", delimpos+1,
-		h_errno == NETDB_INTERNAL ? strerror(errno) :
-		(char *)hstrerror(h_errno));
-	 return STAT_NORETRY;
+      if ((rc = xiogetaddrinfo(delimpos+1, NULL, PF_UNSPEC, 0, 0,
+			       &sau, &socklen, 0, 0))
+	  != STAT_OK) {
+	 return rc;
       }
-      netmask_in->s_addr = *(uint32_t *)maskaddr->h_addr_list[0];
+      netmask_in->s_addr = sau.ip4.sin_addr.s_addr;
    } else {
       Error1("xioparsenetwork_ip4(\"%s\",,): missing netmask delimiter", rangename);
       free(rangename1);
       return STAT_NORETRY;
    }
    {
-      struct hostent *nameaddr;
       *delimpos = 0;
-      if ((nameaddr = Gethostbyname(rangename1)) == NULL) {
-	 /* note: cast is req on AIX: */
-	 Error2("gethostbyname(\"%s\"): %s", rangename1,
-		h_errno == NETDB_INTERNAL ? strerror(errno) :
-		(char *)hstrerror(h_errno));
-	    free(rangename1);
-	 return STAT_NORETRY;
+      if ((rc = xiogetaddrinfo(rangename1, NULL, PF_UNSPEC, 0, 0,
+			       &sau, &socklen, 0, 0))
+	  != STAT_OK) {
+	 return rc;
       }
-      netaddr_in->s_addr = *(uint32_t *)nameaddr->h_addr_list[0];
+      netaddr_in->s_addr = sau.ip4.sin_addr.s_addr;
    }
    free(rangename1);
    return STAT_OK;
--- a/xio-proxy.c	
+++ a/xio-proxy.c	
@@ -11,6 +11,7 @@ 
 
 #include "xioopen.h"
 #include "xio-socket.h"
+#include "xio-ip.h"
 #include "xio-ipapp.h"
 #include "xio-ascii.h"	/* for base64 encoding of authentication */
 
@@ -231,7 +232,9 @@ static int xioopen_proxy_connect(int argc, const char *argv[], struct opt *opts,
 
 int _xioopen_proxy_prepare(struct proxyvars *proxyvars, struct opt *opts,
 			   const char *targetname, const char *targetport) {
-   struct hostent *host;
+   union sockaddr_union host;
+   socklen_t socklen = sizeof(host);
+   int rc;
 
    retropt_bool(opts, OPT_IGNORECR, &proxyvars->ignorecr);
    retropt_bool(opts, OPT_PROXY_RESOLVE, &proxyvars->doresolve);
@@ -241,14 +244,10 @@ int _xioopen_proxy_prepare(struct proxyvars *proxyvars, struct opt *opts,
       /* currently we only resolve to IPv4 addresses. This is in accordance to
 	 RFC 2396; however once it becomes clear how IPv6 addresses should be
 	 represented in CONNECT commands this code might be extended */
-      host = Gethostbyname(targetname);
-      if (host == NULL) {
-	 int level = E_WARN;
-	 /* note: cast is req on AIX: */
-	 Msg2(level, "gethostbyname(\"%s\"): %s", targetname,
-	      h_errno == NETDB_INTERNAL ? strerror(errno) :
-	      (char *)hstrerror(h_errno)/*0 h_messages[h_errno-1]*/);
-
+      rc = xiogetaddrinfo(targetname, targetport, PF_UNSPEC,
+			  SOCK_STREAM, IPPROTO_TCP,
+			  &host, &socklen, 0, 0);
+      if (rc != STAT_OK) {
 	 proxyvars->targetaddr = strdup(targetname);
       } else {
 #define LEN 16	/* www.xxx.yyy.zzz\0 */
@@ -256,10 +255,10 @@ int _xioopen_proxy_prepare(struct proxyvars *proxyvars, struct opt *opts,
 	    return STAT_RETRYLATER;
 	 }
 	 snprintf(proxyvars->targetaddr, LEN, "%u.%u.%u.%u",
-		  (unsigned char)host->h_addr_list[0][0],
-		  (unsigned char)host->h_addr_list[0][1],
-		  (unsigned char)host->h_addr_list[0][2],
-		  (unsigned char)host->h_addr_list[0][3]);
+		  ((unsigned char *)&host.ip4.sin_addr.s_addr)[0],
+		  ((unsigned char *)&host.ip4.sin_addr.s_addr)[1],
+		  ((unsigned char *)&host.ip4.sin_addr.s_addr)[2],
+		  ((unsigned char *)&host.ip4.sin_addr.s_addr)[3]);
 #undef LEN
       }
    } else {