dnl Define the input and output configuration header file.
AC_CONFIG_HEADER([config.h])
-dnl Demand at least version 2.13 of autoconf
-AC_PREREQ(2.13)
+dnl Demand at least version 2.50 of autoconf
+AC_PREREQ(2.50)
dnl Find out what type of system we are
AC_CANONICAL_HOST
dnl Checks for header files.
AC_HEADER_STDC
-AC_CHECK_HEADERS(crypt.h poll.h stdint.h sys/devpoll.h sys/epoll.h sys/event.h sys/param.h sys/socket.h)
+AC_CHECK_HEADERS(crypt.h poll.h inttypes.h stdint.h sys/devpoll.h sys/epoll.h sys/event.h sys/param.h sys/socket.h)
dnl Checks for typedefs, structures, and compiler characteristics
dnl AC_C_CONST
AC_TYPE_UID_T
unet_CHECK_TYPE_SIZES
AC_CHECK_TYPE(socklen_t, unsigned int)
+AC_CHECK_TYPE(struct sockaddr_in6, [unet_have_sockaddr_in6="yes"], [unet_have_sockaddr_in6="no"], [#include <sys/types.h>
+#include <netinet/in.h>])
dnl Checks for library functions.
AC_CHECK_FUNCS([kqueue setrlimit getrusage times])
AC_PROG_MAKE_SET
AC_PROG_INSTALL
AC_PROG_LN_S
-AC_PROG_LEX
-AC_PROG_YACC
AC_PATH_PROGS(RMPROG, rm, /bin/rm)
AC_PATH_PROGS(SHPROG, sh, /bin/sh)
+dnl (F)LEX - needed for the new conf file parser
+AC_PROG_LEX
+if test -x "$LEX"
+then
+ AC_MSG_ERROR([Cannot find flex.])
+fi
+
+if test -z "$LEXLIB"
+then
+ AC_MSG_FAILURE([
+ Cannot find a library with yywrap() in, but flex was found.
+ It's possible the compiler you're using ($CC) is incompatible with the
+ installed library.])
+fi
+
LIBS="$LEXLIB $LIBS"
+dnl YACC - ditto
+AC_PROG_YACC
+if test -z "$YACC"
+then
+ AC_MSG_ERROR([Cannot find yacc.])
+fi
+
+
unet_NONBLOCKING
unet_SIGNALS
fi
fi
+AC_ARG_WITH([ipv6],
+ AS_HELP_STRING([--without-ipv6], [disable IPv6 support (default is autodetect)]),
+ [ac_cv_use_ipv6=$withval],
+ [ac_cv_use_ipv6=$unet_have_sockaddr_in6])
+AC_CACHE_CHECK([whether to use IPv6], [ac_cv_use_ipv6], [ac_cv_use_ipv6=no])
+if test x"$ac_cv_use_ipv6" != "xno" ; then
+ AC_DEFINE([IPV6], , [Enable IPv6 support])
+fi
+
dnl And now for --disable-asserts
AC_MSG_CHECKING([whether to enable asserts])
AC_ARG_ENABLE([asserts],