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diff --git a/m4/socketlib.m4 b/m4/socketlib.m4
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+# socketlib.m4 serial 3
+dnl Copyright (C) 2008-2022 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.
+
+dnl gl_SOCKETLIB
+dnl Determines the library to use for socket functions.
+dnl Sets and AC_SUBSTs LIBSOCKET.
+
+AC_DEFUN([gl_SOCKETLIB],
+[
+ gl_PREREQ_SYS_H_WINSOCK2 dnl for HAVE_WINSOCK2_H
+ LIBSOCKET=
+ if test $HAVE_WINSOCK2_H = 1; then
+ dnl Native Windows API (not Cygwin).
+ dnl If the function WSAStartup exists (declared in <winsock2.h> and
+ dnl defined through -lws2_32), we need to call it.
+ AC_CACHE_CHECK([for WSAStartup],
+ [gl_cv_func_wsastartup], [
+ gl_save_LIBS="$LIBS"
+ LIBS="$LIBS -lws2_32"
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM([[
+#ifdef HAVE_WINSOCK2_H
+# include <winsock2.h>
+#endif]], [[
+ WORD wVersionRequested = MAKEWORD(1, 1);
+ WSADATA wsaData;
+ int err = WSAStartup(wVersionRequested, &wsaData);
+ WSACleanup ();
+ ]])
+ ],
+ [gl_cv_func_wsastartup=yes],
+ [gl_cv_func_wsastartup=no])
+ LIBS="$gl_save_LIBS"
+ ])
+ if test "$gl_cv_func_wsastartup" = "yes"; then
+ AC_DEFINE([WINDOWS_SOCKETS], [1], [Define if WSAStartup is needed.])
+ LIBSOCKET='-lws2_32'
+ fi
+ else
+ dnl Unix API.
+ dnl Solaris has most socket functions in libsocket.
+ dnl Haiku has most socket functions in libnetwork.
+ dnl BeOS has most socket functions in libnet.
+ dnl On HP-UX, do NOT link with libxnet, because in 64-bit mode this would
+ dnl break code (e.g. in libraries) that invokes accept(), getpeername(),
+ dnl getsockname(), getsockopt(), or recvfrom() with a 32-bit addrlen. See
+ dnl "man xopen_networking" for details.
+ AC_CACHE_CHECK([for library containing setsockopt], [gl_cv_lib_socket], [
+ gl_cv_lib_socket=
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
+#ifdef __cplusplus
+"C"
+#endif
+char setsockopt();]], [[setsockopt();]])],
+ [],
+ [gl_save_LIBS="$LIBS"
+ LIBS="$gl_save_LIBS -lsocket"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
+#ifdef __cplusplus
+"C"
+#endif
+char setsockopt();]], [[setsockopt();]])],
+ [gl_cv_lib_socket="-lsocket"])
+ if test -z "$gl_cv_lib_socket"; then
+ LIBS="$gl_save_LIBS -lnetwork"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
+#ifdef __cplusplus
+"C"
+#endif
+char setsockopt();]], [[setsockopt();]])],
+ [gl_cv_lib_socket="-lnetwork"])
+ if test -z "$gl_cv_lib_socket"; then
+ LIBS="$gl_save_LIBS -lnet"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
+#ifdef __cplusplus
+"C"
+#endif
+char setsockopt();]], [[setsockopt();]])],
+ [gl_cv_lib_socket="-lnet"])
+ fi
+ fi
+ LIBS="$gl_save_LIBS"
+ ])
+ if test -z "$gl_cv_lib_socket"; then
+ gl_cv_lib_socket="none needed"
+ fi
+ ])
+ if test "$gl_cv_lib_socket" != "none needed"; then
+ LIBSOCKET="$gl_cv_lib_socket"
+ fi
+ fi
+ AC_SUBST([LIBSOCKET])
+])