1# =========================================================================== 2# https://www.gnu.org/software/autoconf-archive/ax_lib_socket_nsl.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_LIB_SOCKET_NSL 8# 9# DESCRIPTION 10# 11# This macro figures out what libraries are required on this platform to 12# link sockets programs. 13# 14# The common cases are not to need any extra libraries, or to need 15# -lsocket and -lnsl. We need to avoid linking with libnsl unless we need 16# it, though, since on some OSes where it isn't necessary it will totally 17# break networking. Unisys also includes gethostbyname() in libsocket but 18# needs libnsl for socket(). 19# 20# LICENSE 21# 22# Copyright (c) 2008 Russ Allbery <rra@stanford.edu> 23# Copyright (c) 2008 Stepan Kasal <kasal@ucw.cz> 24# Copyright (c) 2008 Warren Young <warren@etr-usa.com> 25# 26# Copying and distribution of this file, with or without modification, are 27# permitted in any medium without royalty provided the copyright notice 28# and this notice are preserved. This file is offered as-is, without any 29# warranty. 30 31#serial 7 32 33AU_ALIAS([LIB_SOCKET_NSL], [AX_LIB_SOCKET_NSL]) 34AC_DEFUN([AX_LIB_SOCKET_NSL], 35[ 36 AC_SEARCH_LIBS([gethostbyname], [nsl]) 37 AC_SEARCH_LIBS([socket], [socket], [], [ 38 AC_CHECK_LIB([socket], [socket], [LIBS="-lsocket -lnsl $LIBS"], 39 [], [-lnsl])]) 40]) 41