dnl @synopsis ACX_WHICH_GETHOSTBYNAME_R
dnl
dnl Provides a test to determine the correct way to call gethostbyname_r
dnl
dnl defines HAVE_GETHOSTBYNAME_R to the number of arguments required
dnl
dnl e.g. 6 arguments (linux)
dnl e.g. 5 arguments (solaris)
dnl e.g. 3 arguments (osf/1)
dnl
dnl @author Brian Stafford <brian@stafford.uklinux.net>
dnl
dnl based on version by Caolan McNamara <caolan@skynet.ie>
dnl based on David Arnold's autoconf suggestion in the threads faq
dnl
AC_DEFUN([ACX_WHICH_GETHOSTBYNAME_R],
[AC_CACHE_CHECK(number of arguments to gethostbyname_r,
                acx_which_gethostbyname_r, [
        AC_TRY_COMPILE([
#               include <netdb.h> 
        ],      [

        char *name;
        struct hostent *he;
        struct hostent_data data;
        (void) gethostbyname_r(name, he, &data);

                ],acx_which_gethostbyname_r=3, 
                        [
dnl                     acx_which_gethostbyname_r=0
  AC_TRY_COMPILE([
#   include <netdb.h>
  ], [
        char *name;
        struct hostent *he, *res;
        char *buffer = NULL;
        int buflen = 2048;
        int h_errnop;
        (void) gethostbyname_r(name, he, buffer, buflen, &res, &h_errnop)
  ],acx_which_gethostbyname_r=6,
  
  [
dnl  acx_which_gethostbyname_r=0
  AC_TRY_COMPILE([
#   include <netdb.h>
  ], [
                        char *name;
                        struct hostent *he;
                        char *buffer = NULL;
                        int buflen = 2048;
                        int h_errnop;
                        (void) gethostbyname_r(name, he, buffer, buflen, &h_errnop)
  ],acx_which_gethostbyname_r=5,acx_which_gethostbyname_r=0)

  ]
  
  )
                        ]
                )
        ])

if test $acx_which_gethostbyname_r -gt 0 ; then
    AC_DEFINE_UNQUOTED([HAVE_GETHOSTBYNAME_R], $acx_which_gethostbyname_r,
                       [Number of parameters to gethostbyname_r or 0 if not available])
fi

])

dnl @synopsis ACX_HELP_STRING(OPTION,DESCRIPTION)
AC_DEFUN([ACX_HELP_STRING],
         [  $1 builtin([substr],[                       ],len($1))[$2]])


dnl @synopsis ACX_FEATURE(ENABLE_OR_WITH,NAME[,VALUE])
AC_DEFUN([ACX_FEATURE],
         [echo "builtin([substr],[                                  ],len(--$1-$2))--$1-$2: ifelse($3,,[$]translit($1-$2,-,_),$3)"])