diff -ruwN source/defines.h source-new/defines.h
--- source/defines.h	2026-08-11 09:22:17.000000000 +0700
+++ source-new/defines.h	2026-09-11 07:06:03.149580789 +0700
@@ -48,8 +48,9 @@
  * netinet/in.h.
  */
 
-#ifdef HAVE_CYGWIN
+#if defined(HAVE_CYGWIN) || defined(__redox__)
 #define IPPORT_RESERVED 0
+#define IN_LOOPBACKNET 127
 #endif
 
 /*
@@ -465,12 +466,21 @@
 
 #ifdef MAIL_DIRECTORY
 # define _PATH_MAILDIR MAIL_DIRECTORY
+#else
+# define _PATH_MAILDIR "/var/mail"
 #endif
 
 #ifndef _PATH_NOLOGIN
 # define _PATH_NOLOGIN "/etc/nologin"
 #endif
 
+#ifndef ST_RDONLY
+#define ST_RDONLY	1
+#endif
+#ifndef ST_NOSUID
+#define ST_NOSUID	2
+#endif
+
 /* Define this to be the path of the xauth program. */
 #ifdef XAUTH_PATH
 #define _PATH_XAUTH XAUTH_PATH
diff -ruwN source/hostfile.c source-new/hostfile.c
--- source/hostfile.c	2026-08-11 09:22:17.000000000 +0700
+++ source-new/hostfile.c	2026-09-11 07:01:03.333834076 +0700
@@ -44,7 +44,9 @@
 #include <netinet/in.h>
 
 #include <errno.h>
+#ifndef __redox__
 #include <resolv.h>
+#endif
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
diff -ruwN source/openbsd-compat/getrrsetbyname.h source-new/openbsd-compat/getrrsetbyname.h
--- source/openbsd-compat/getrrsetbyname.h	2026-08-11 09:22:17.000000000 +0700
+++ source-new/openbsd-compat/getrrsetbyname.h	2026-09-11 05:45:17.107967449 +0700
@@ -54,9 +54,11 @@
 
 #include <sys/types.h>
 #include <netinet/in.h>
+#ifndef __redox__
 #include <arpa/nameser.h>
-#include <netdb.h>
 #include <resolv.h>
+#endif
+#include <netdb.h>
 
 #ifndef HFIXEDSZ
 #define HFIXEDSZ 12
diff -ruwN source/regress/netcat.c source-new/regress/netcat.c
--- source/regress/netcat.c	2026-08-11 09:22:17.000000000 +0700
+++ source-new/regress/netcat.c	2026-09-11 07:01:28.245263830 +0700
@@ -1380,7 +1380,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#ifndef __redox__
 #include <resolv.h>
+#endif
 
 #define SOCKS_PORT	"1080"
 #define HTTP_PROXY_PORT	"3128"
diff -ruwN source/sshbuf-misc.c source-new/sshbuf-misc.c
--- source/sshbuf-misc.c	2026-08-11 09:22:17.000000000 +0700
+++ source-new/sshbuf-misc.c	2026-09-11 07:01:51.946601518 +0700
@@ -26,7 +26,9 @@
 #include <stdio.h>
 #include <limits.h>
 #include <string.h>
+#ifndef __redox__
 #include <resolv.h>
+#endif
 #include <ctype.h>
 #include <unistd.h>
 
diff -ruwN source/sshkey.c source-new/sshkey.c
--- source/sshkey.c	2026-08-11 09:22:17.000000000 +0700
+++ source-new/sshkey.c	2026-09-11 07:00:41.360425523 +0700
@@ -45,7 +45,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#ifndef __redox__
 #include <resolv.h>
+#endif
 #include <time.h>
 #include <util.h>