##### http://autoconf-archive.cryp.to/etr_socket_nsl.html
#
# OBSOLETE MACRO
#
#   Use LIB_SOCKET_NSL instead.
#
# SYNOPSIS
#
#   ETR_SOCKET_NSL
#
# DESCRIPTION
#
#   This macro figures out what libraries are required on this platform
#   to link sockets programs. It's usually -lsocket and/or -lnsl or
#   neither. We test for all three combinations.
#
# LAST MODIFICATION
#
#   2005-09-02
#
# COPYLEFT
#
#   Copyright (c) 2005 Warren Young <warren@etr-usa.com>
#
#   Copying and distribution of this file, with or without
#   modification, are permitted in any medium without royalty provided
#   the copyright notice and this notice are preserved.

AC_DEFUN([ETR_SOCKET_NSL],
[
AC_CACHE_CHECK(for libraries containing socket functions,
ac_cv_socket_libs, [
        oCFLAGS=$CFLAGS

        AC_TRY_LINK([
                        #include <sys/types.h>
                        #include <sys/socket.h>
                        #include <netinet/in.h>
                        #include <arpa/inet.h>
                ],
                [
                        struct in_addr add;
                        int sd = socket(AF_INET, SOCK_STREAM, 0);
                        inet_ntoa(add);
                ],
                ac_cv_socket_libs=-lc, ac_cv_socket_libs=no)

        if test x"$ac_cv_socket_libs" = "xno"
        then
                CFLAGS="$oCFLAGS -lsocket"
                AC_TRY_LINK([
                                #include <sys/types.h>
                                #include <sys/socket.h>
                                #include <netinet/in.h>
                                #include <arpa/inet.h>
                        ],
                        [
                                struct in_addr add;
                                int sd = socket(AF_INET, SOCK_STREAM, 0);
                                inet_ntoa(add);
                        ],
                        ac_cv_socket_libs=-lsocket, ac_cv_socket_libs=no)
        fi

        if test x"$ac_cv_socket_libs" = "xno"
        then
                CFLAGS="$oCFLAGS -lsocket -lnsl"
                AC_TRY_LINK([
                                #include <sys/types.h>
                                #include <sys/socket.h>
                                #include <netinet/in.h>
                                #include <arpa/inet.h>
                        ],
                        [
                                struct in_addr add;
                                int sd = socket(AF_INET, SOCK_STREAM, 0);
                                inet_ntoa(add);
                        ],
                        ac_cv_socket_libs="-lsocket -lnsl", ac_cv_socket_libs=no)
        fi

        CFLAGS=$oCFLAGS
])

        if test x"$ac_cv_socket_libs" = "xno"
        then
                AC_MSG_ERROR([Cannot find socket libraries])
        elif test x"$ac_cv_socket_libs" = "x-lc"
        then
                ETR_SOCKET_LIBS=""
        else
                ETR_SOCKET_LIBS="$ac_cv_socket_libs"
        fi

        AC_SUBST(ETR_SOCKET_LIBS)
]) dnl ETR_SOCKET_NSL