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diff --git a/m4/inet_ntop.m4 b/m4/inet_ntop.m4
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+# inet_ntop.m4 serial 21
+dnl Copyright (C) 2005-2006, 2008-2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_INET_NTOP],
+[
+ AC_REQUIRE([gl_ARPA_INET_H_DEFAULTS])
+
+ dnl Persuade Solaris <arpa/inet.h> to declare inet_ntop.
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+ AC_REQUIRE([AC_C_RESTRICT])
+
+ dnl Most platforms that provide inet_ntop define it in libc.
+ dnl Solaris 8..10 provide inet_ntop in libnsl instead.
+ dnl Solaris 2.6..7 provide inet_ntop in libresolv instead.
+ dnl Haiku provides it in -lnetwork.
+ dnl Native Windows provides it in -lws2_32 instead, with a declaration in
+ dnl <ws2tcpip.h>, and it uses stdcall calling convention, not cdecl
+ dnl (hence we cannot use AC_CHECK_FUNCS, AC_SEARCH_LIBS to find it).
+ HAVE_INET_NTOP=1
+ INET_NTOP_LIB=
+ gl_PREREQ_SYS_H_WINSOCK2
+ if test $HAVE_WINSOCK2_H = 1; then
+ dnl It needs to be overridden, because the stdcall calling convention
+ dnl is not compliant with POSIX. Set REPLACE_INET_NTOP in order to avoid
+ dnl a name conflict at the linker level, even though the header file
+ dnl <ws2tcpip.h> declares inet_ntop only if _WIN32_WINNT >= 0x0600.
+ REPLACE_INET_NTOP=1
+ AC_CHECK_DECLS([inet_ntop],,, [[#include <ws2tcpip.h>]])
+ if test $ac_cv_have_decl_inet_ntop = yes; then
+ INET_NTOP_LIB="-lws2_32"
+ else
+ HAVE_DECL_INET_NTOP=0
+ fi
+ else
+ gl_save_LIBS=$LIBS
+ AC_SEARCH_LIBS([inet_ntop], [nsl resolv network], [],
+ [AC_CHECK_FUNCS([inet_ntop])
+ if test $ac_cv_func_inet_ntop = no; then
+ HAVE_INET_NTOP=0
+ fi
+ ])
+ LIBS=$gl_save_LIBS
+
+ if test "$ac_cv_search_inet_ntop" != "no" \
+ && test "$ac_cv_search_inet_ntop" != "none required"; then
+ INET_NTOP_LIB="$ac_cv_search_inet_ntop"
+ fi
+
+ AC_CHECK_HEADERS_ONCE([netdb.h])
+ AC_CHECK_DECLS([inet_ntop],,,
+ [[#include <arpa/inet.h>
+ #if HAVE_NETDB_H
+ # include <netdb.h>
+ #endif
+ ]])
+ if test $ac_cv_have_decl_inet_ntop = no; then
+ HAVE_DECL_INET_NTOP=0
+ fi
+ fi
+ AC_SUBST([INET_NTOP_LIB])
+])
+
+# Prerequisites of lib/inet_ntop.c.
+AC_DEFUN([gl_PREREQ_INET_NTOP], [
+ AC_REQUIRE([gl_SOCKET_FAMILIES])
+])