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      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 (a] stanford.edu>
     23 #   Copyright (c) 2008 Stepan Kasal <kasal (a] ucw.cz>
     24 #   Copyright (c) 2008 Warren Young <warren (a] 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 
     33 AU_ALIAS([LIB_SOCKET_NSL], [AX_LIB_SOCKET_NSL])
     34 AC_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