socat/configure.in

nl source: configure.in
dnl Copyright Gerhard Rieger 2001-2011
dnl Published under the GNU General Public License V.2, see file COPYING

dnl Process this file with autoconf to produce a configure script.
AC_INIT(socat.c)

AC_CONFIG_HEADER(config.h)

if test -f /usr/xpg4/bin/fgrep; then
   FGREP=/usr/xpg4/bin/fgrep   # Solaris
else
   FGREP=fgrep
fi

# find out which defines gcc passes to cpp, so makedepend does not run into
# (harmless) "error architecture not supported"
AC_MSG_CHECKING(which defines needed for makedepend)
__cpp_defs=`gcc -v -E - </dev/null 2>&1 |$FGREP -e '/cpp ' -e '/cc1 '`
SYSDEFS=`aa=; for a in $__cpp_defs
	do case "$a" in -D*) aa="$aa $a";; esac; done; echo "$aa"`
AC_SUBST(SYSDEFS)
AC_MSG_RESULT($SYSDEFS)


# this must come before AC_PROG_CC
if test -z "$CFLAGS"; then
   # if CFLAGS is not set, we preset it to -O
   # with this setting, we prevent autoconf from defaulting to "-g -O2"
   export CFLAGS=-O
fi

dnl Checks for programs.
AC_PROG_INSTALL(install)
AC_PROG_CC
AC_PROG_RANLIB
AC_SUBST(AR)
AC_CHECK_PROG(AR, ar, ar, gar)
#
# we need to explicitely call this here; otherwise, with --disable-libwrap we
# fail
AC_LANG_COMPILER_REQUIRE()

if test "$GCC" = yes; then
   CFLAGS="$CFLAGS -D_GNU_SOURCE -Wall -Wno-parentheses"
   ERRONWARN="-Werror -O0"
else
   # Sun Studio?
   ERRONWARN="-errwarn"
fi
export CFLAGS


dnl Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS(inttypes.h)
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS(fcntl.h limits.h strings.h sys/param.h sys/ioctl.h sys/time.h syslog.h unistd.h)
AC_CHECK_HEADERS(pwd.h grp.h stdint.h sys/types.h sys/poll.h sys/socket.h sys/uio.h sys/stat.h netdb.h sys/un.h)
AC_CHECK_HEADERS(pty.h)
AC_CHECK_HEADERS(netinet/in.h netinet/in_systm.h)
AC_CHECK_HEADERS(netinet/ip.h, [], [], [AC_INCLUDES_DEFAULT
	#if HAVE_NETINET_IN_H && HAVE_NETINET_IN_SYSTM_H
	#include <netinet/in.h>
	#include <netinet/in_systm.h>
	#endif])	# Solaris prerequisites for netinet/ip.h
AC_CHECK_HEADERS(netinet/tcp.h)
AC_CHECK_HEADER(net/if.h, [], [], [AC_INCLUDES_DEFAULT
	#if HAVE_SYS_SOCKET_H
	#include <sys/socket.h>
	#endif])	# Mac OS X requires including sys/socket.h
AC_CHECK_HEADERS(arpa/nameser.h)

AC_HEADER_RESOLV()

AC_CHECK_HEADERS(termios.h linux/if_tun.h)
AC_CHECK_HEADERS(net/if_dl.h)
AC_CHECK_HEADERS(linux/types.h linux/errqueue.h)
AC_CHECK_HEADERS(sys/utsname.h sys/select.h sys/file.h)
AC_CHECK_HEADERS(util.h libutil.h sys/stropts.h regex.h)
AC_CHECK_HEADERS(linux/fs.h linux/ext2_fs.h)

dnl Checks for setgrent, getgrent and endgrent.
AC_CHECK_FUNCS(setgrent getgrent endgrent)

dnl Link libresolv if necessary (for Mac OS X)
AC_SEARCH_LIBS([res_9_init], [resolv])


dnl Check for extra socket library (for Solaris)
AC_CHECK_FUNC(hstrerror,  , AC_CHECK_LIB(resolv, hstrerror, [LIBS="$LIBS -lresolv"; AC_DEFINE(HAVE_HSTRERROR)]))
AC_CHECK_FUNC(gethostent, , AC_CHECK_LIB(nsl, gethostent))
AC_CHECK_FUNC(setsockopt, , AC_CHECK_LIB(socket, setsockopt))


dnl Check for hstrerror prototype
AC_MSG_CHECKING(for hstrerror prototype)
AC_CACHE_VAL(sc_cv_have_prototype_hstrerror,
[CFLAGS1="$CFLAGS"; CFLAGS="$ERRONWARN $(echo "$CFLAGS1" | sed -e 's@-Wall@@g')";
 AC_TRY_COMPILE([#include <netdb.h>],[hstrerror();],
 [sc_cv_have_prototype_hstrerror=no],
 [sc_cv_have_prototype_hstrerror=yes]);
 CFLAGS="$CFLAGS1"])
if test $sc_cv_have_prototype_hstrerror = yes; then
   AC_DEFINE(HAVE_PROTOTYPE_HSTRERROR)
fi
AC_MSG_RESULT($sc_cv_have_prototype_hstrerror)


AC_MSG_CHECKING(whether to include help)
AC_ARG_ENABLE(help, [  --disable-help          disable help],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_HELP) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_HELP) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include STDIO support)
AC_ARG_ENABLE(stdio, [  --disable-stdio         disable STDIO support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_STDIO) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_STDIO) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include FD-number support)
AC_ARG_ENABLE(fdnum, [  --disable-fdnum         disable FD-number support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_FDNUM) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_FDNUM) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include direct file support)
AC_ARG_ENABLE(file, [  --disable-file          disable direct file support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_FILE) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_FILE) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include direct create support)
AC_ARG_ENABLE(creat, [  --disable-creat         disable direct create support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_CREAT) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_CREAT) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include gopen support)
AC_ARG_ENABLE(gopen, [  --disable-gopen         disable open for UNIX socket support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_GOPEN) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_GOPEN) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include explicit pipe support)
AC_ARG_ENABLE(pipe, [  --disable-pipe          disable pipe support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_PIPE) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_PIPE) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include explicit termios support)
AC_ARG_ENABLE(termios, [  --disable-termios       disable termios support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_TERMIOS) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_TERMIOS) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include UNIX socket support)
AC_ARG_ENABLE(unix, [  --disable-unix          disable UNIX domain socket support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_UNIX) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_UNIX) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include abstract UNIX socket support)
AC_ARG_ENABLE(abstract_unixsocket, [  --disable-abstract-unixsocket   disable abstract UNIX domain socket support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_ABSTRACT_UNIXSOCKET) AC_MSG_RESULT(yes);;
	       esac],
	      [ case "`uname`" in
	        Linux)
		    AC_DEFINE(WITH_ABSTRACT_UNIXSOCKET) AC_MSG_RESULT(yes);;
		*)
		    AC_MSG_RESULT(no);;
		esac])

AC_MSG_CHECKING(whether to include IPv4 support)
AC_ARG_ENABLE(ip4, [  --disable-ip4           disable IPv4 support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_IP4) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_IP4) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include IPv6 support)
AC_ARG_ENABLE(ip6, [  --disable-ip6           disable IPv6 support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no); WITH_IP6= ;;
	       *) AC_MSG_RESULT(yes); WITH_IP6=1 ;;
	       esac],
	      [ AC_MSG_RESULT(yes);  WITH_IP6=1 ])
if test "$WITH_IP6"; then
  AC_CHECK_HEADERS([netinet/ip6.h],
    [AC_DEFINE(HAVE_NETINET_IP6_H) AC_DEFINE(WITH_IP6)],
    [AC_MSG_WARN([include file netinet/ip6.h not found, disabling IP6])],
    [AC_INCLUDES_DEFAULT
     #ifdef HAVE_NETINET_IN_H
     # include <netinet/in.h>
     #endif])
  AC_CHECK_HEADERS(netinet6/in6.h)	# found on OpenBSD and Lion, used for IPV6_*

AC_MSG_CHECKING(if __APPLE_USE_RFC_2292 is helpful)
AC_CACHE_VAL(ac_cv_apple_use_rfc_2292,
 [AC_TRY_COMPILE(,[#ifndef IPV6_HOPOPTS
  murks;
#endif],
 [ac_cv_apple_use_rfc_2292=no],
 [AC_TRY_COMPILE([#define __APPLE_USE_RFC_2292],
 [#ifndef IPV6_HOPOPTS
  murks;
#endif],
   [ac_cv_apple_use_rfc_2292=yes],
   [ac_cv_apple_use_rfc_2292=no]
 )]
)])
if test "$ac_cv_apple_use_rfc_2292" = yes; then
  AC_DEFINE(__APPLE_USE_RFC_2292)
fi
AC_MSG_RESULT($ac_cv_apple_use_rfc_2292)

fi

AC_MSG_CHECKING(whether to include raw IP support)
AC_ARG_ENABLE(rawip, [  --disable-rawip         disable raw IP support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_RAWIP) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_RAWIP) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include generic socket support)
AC_ARG_ENABLE(rawsocket, [  --disable-genericsocket disable generic socket support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_GENERICSOCKET) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_GENERICSOCKET) AC_MSG_RESULT(yes)])
AC_MSG_CHECKING(whether to include raw network interface support)
AC_ARG_ENABLE(interface, [  --disable-interface  disable network interface support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no); WITH_INTERFACE= ;;
	       *) AC_MSG_RESULT(yes); WITH_INTERFACE=1 ;;
	       esac],
	       [AC_MSG_RESULT(yes);  WITH_INTERFACE=1 ])
if test "$WITH_INTERFACE"; then
  AC_CHECK_HEADER(netpacket/packet.h,
    AC_DEFINE(HAVE_NETPACKET_PACKET_H),
    [WITH_INTERFACE=;
     AC_MSG_WARN([include file netpacket/packet.h not found, disabling interface])])
fi
if test "$WITH_INTERFACE"; then
  AC_CHECK_HEADER(netinet/if_ether.h,
    AC_DEFINE(HAVE_NETINET_IF_ETHER_H),
    [WITH_INTERFACE=;
     AC_MSG_WARN([include file netinet/if_ether.h not found, disabling interface])])
fi
if test "$WITH_INTERFACE"; then
   AC_DEFINE(WITH_INTERFACE)
fi

AC_MSG_CHECKING(whether to include TCP support)
AC_ARG_ENABLE(tcp, [  --disable-tcp           disable TCP support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_TCP) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_TCP) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include UDP support)
AC_ARG_ENABLE(udp, [  --disable-udp           disable UDP support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_UDP) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_UDP) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include SCTP support)
AC_ARG_ENABLE(sctp, [  --disable-sctp           disable SCTP support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no); WITH_SCTP= ;;
	       *) AC_MSG_RESULT(yes); WITH_SCTP=1 ;;
	       esac],
	       [AC_MSG_RESULT(yes);   WITH_SCTP=1 ])

if test -n "$WITH_SCTP"; then
AC_MSG_CHECKING(for IPPROTO_SCTP)
AC_CACHE_VAL(sc_cv_define_ipproto_sctp,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
[IPPROTO_SCTP;],
[sc_cv_define_ipproto_sctp=yes],
[sc_cv_define_ipproto_sctp=no])])
AC_MSG_RESULT($sc_cv_define_ipproto_sctp)
if test $sc_cv_define_ipproto_sctp = yes; then
   AC_DEFINE(WITH_SCTP)
else
   AC_MSG_WARN([IPPROTO_SCTP undefined, disabling SCTP support])
fi
fi

AC_MSG_CHECKING(whether to include listen support)
AC_ARG_ENABLE(listen, [  --disable-listen        disable listen support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_LISTEN) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_LISTEN) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include socks4 support)
AC_ARG_ENABLE(socks4, [  --disable-socks4        disable socks4 support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_SOCKS4) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_SOCKS4) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include socks4a support)
AC_ARG_ENABLE(socks4a, [  --disable-socks4a       disable socks4a support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_SOCKS4A) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_SOCKS4A) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include proxy connect support)
AC_ARG_ENABLE(proxy, [  --disable-proxy         disable proxy connect support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_PROXY) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_PROXY) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include exec support)
AC_ARG_ENABLE(exec, [  --disable-exec          disable exec support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_EXEC) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_EXEC) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING([whether to include system (shell) support])
AC_ARG_ENABLE(system, [  --disable-system        disable system (shell) support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_SYSTEM) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_SYSTEM) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include pty address support)
AC_ARG_ENABLE(pty, [  --disable-pty           disable pty support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_PTY) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_PTY) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include ext2 fs attributes support)
AC_ARG_ENABLE(ext2, [  --disable-ext2          disable ext2 fs attributes support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_EXT2) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_EXT2) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(whether to include readline support)
AC_ARG_ENABLE(readline, [  --disable-readline      disable readline support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no); WITH_READLINE= ;;
	       *) AC_MSG_RESULT(yes); WITH_READLINE=1 ;;
	       esac],
	       [AC_MSG_RESULT(yes);   WITH_READLINE=1 ])

if test -n "$WITH_READLINE"; then
  CPPFLAGS_ORIG=$CPPFLAGS
  CFLAGS_ORIG=$CFLAGS
  LIBS_ORIG=$LIBS
  sc_usable_readline_found=
  
  for D in "" "/usr/local" "/opt/local" "/sw" "/opt/freeware" "/usr/sfw"; do    
    if test -n "$D" ; then
      CPPFLAGS="$CPPFLAGS -I$D/include"
      CFLAGS="$CFLAGS -L$D/lib"
      DLOC="in location $D"
    else
      DLOC="in default location"
    fi
    AC_MSG_CHECKING(for usable readline $DLOC)
    
    # Some systems require -lcurses, some require -lncurses.
    # Mac OS X 10.4 (and others) ships with libedit masquerading as readline,
    # but it doesn't work well with socat. It can be recognized by the absence
    # of append_history.
    
    for L in "" "-lcurses" "-lncurses"; do
      LIBS="$LIBS_ORIG -lreadline $L"
      AC_TRY_LINK(
        [ #include <stdio.h>
          #include <readline/readline.h>
          #include <readline/history.h>],
        [ readline(NULL);
          append_history(0, NULL); ],
        [ sc_usable_readline_found=1
          break ])
    done
    
    if test -n "$sc_usable_readline_found"; then
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_READLINE_READLINE_H,1)
      AC_DEFINE(HAVE_READLINE_HISTORY_H,1)
      AC_DEFINE(HAVE_LIBREADLINE,1)
      AC_DEFINE(WITH_READLINE,1)
      break
    else
      AC_MSG_RESULT(no)
      CPPFLAGS=$CPPFLAGS_ORIG
      CFLAGS=$CFLAGS_ORIG
      LIBS=$LIBS_ORIG
    fi
  done
  
  if test -z "$sc_usable_readline_found"; then
    AC_MSG_WARN([no suitable version of readline found; perhaps you need to install a newer version])
  fi
fi

AC_MSG_CHECKING(whether to include openssl support)
AC_ARG_ENABLE(openssl, [  --disable-openssl       disable OpenSSL support],
  [ case "$enableval" in
    no) AC_MSG_RESULT(no); WITH_OPENSSL= ;;
    *) AC_MSG_RESULT(yes); WITH_OPENSSL=1 ;;
   esac],
   [ AC_MSG_RESULT(yes);   WITH_OPENSSL=1 ])
#
if test -n "$WITH_OPENSSL"; then
  AC_MSG_NOTICE(checking for components of OpenSSL)
  # first, we need to find the include file <openssl/ssl.h>
  AC_CACHE_VAL(sc_cv_have_openssl_ssl_h,
    [AC_TRY_COMPILE([#include <openssl/ssl.h>],[;],
      [sc_cv_have_openssl_ssl_h=yes; OPENSSL_ROOT=""; ],
      [sc_cv_have_openssl_ssl_h=no
       for D in "/sw" "/usr/local" "/opt/freeware" "/usr/sfw" "/usr/local/ssl"; do
	I="$D/include"
	i="$I/openssl/ssl.h"
	if test -r "$i"; then
	  #V_INCL="$V_INCL -I$I"
	  CPPFLAGS="$CPPFLAGS -I$I"
	  AC_MSG_NOTICE(found $i)
	  sc_cv_have_openssl_ssl_h=yes; OPENSSL_ROOT="$D"
	  break;
	fi
      done])
  ])
  if test "$sc_cv_have_openssl_ssl_h" = "yes"; then
    AC_DEFINE(HAVE_OPENSSL_SSL_H)
  fi
  AC_MSG_NOTICE(checked for openssl/ssl.h... $sc_cv_have_openssl_ssl_h)
fi	# end checking for openssl/ssl.h
#
if test -n "$WITH_OPENSSL" -a "$sc_cv_have_openssl_ssl_h" = 'yes'; then
  # next, we search for the openssl library (libssl.*)
  # interesting: Linux only requires -lssl, FreeBSD requires -lssl -lcrypto
  # Note, version OpenSSL 0.9.7j requires -lcrypto even on Linux.
  AC_MSG_CHECKING(for libssl)
  AC_CACHE_VAL(sc_cv_have_libssl,
    [ LIBS0="$LIBS"
      if test -n "$OPENSSL_ROOT"; then
	L="$OPENSSL_ROOT/lib"; LIBS="$LIBS -L$L -lssl"
      else
	LIBS="$LIBS -lssl"
      fi
      AC_TRY_LINK([#include <openssl/ssl.h>],
	[SSL_library_init();ERR_error_string()],
	[sc_cv_have_libssl='yes'],
	[ LIBS="$LIBS -lcrypto"
	  AC_TRY_LINK([#include <openssl/ssl.h>],
	  [SSL_library_init()],
	  [sc_cv_have_libssl='yes'],
	  [sc_cv_have_libssl='no'])
        ])
      if test "$sc_cv_have_libssl" != 'yes'; then
	LIBS="$LIBS0"
      fi
    ]
  )
  if test "$sc_cv_have_libssl" = 'yes'; then
    AC_DEFINE(HAVE_LIBSSL)
  fi
  AC_MSG_RESULT($sc_cv_have_libssl)
fi
#
#    # a possible location for openssl (on Sourceforge/Solaris)
#    AC_CHECK_FILE(/usr/local/ssl/lib, LIBS="$LIBS -L/usr/local/ssl/lib/")
#    # sometimes on Solaris:
#    AC_CHECK_FILE(/pkgs/lib, LIBS="$LIBS -L/pkgs/lib/")
#    # for AIX 5.1 with Linux toolbox:
#    AC_CHECK_FILE(/opt/freeware/lib, LIBS="$LIBS -L/opt/freeware/lib/")
#
#    AC_CHECK_LIB(crypto, main)
#    AC_CHECK_LIB(ssl, main)
#
#    # MacOSX has openssl includes in another directory
#    if test -d /sw/include/; then
#	V_INCL="$V_INCL -I/sw/include"
#    # and Solaris at sourceforge here:
#    elif test -d /usr/local/ssl/include/; then
#	V_INCL="$V_INCL -I/usr/local/ssl/include"
#    # and AIX 5.1 with Linux toolbox:
#    elif test -d /opt/freeware/include; then
#	V_INCL="$V_INCL -I/opt/freeware/include"
#    fi
#fi
if test -n "$WITH_OPENSSL"; then
  if test "$sc_cv_have_openssl_ssl_h" = "yes" -a "$sc_cv_have_libssl" = "yes"; then
    AC_DEFINE(WITH_OPENSSL)
  else
    AC_MSG_WARN([not all components of OpenSSL found, disabling it]);
  fi
fi

# check for fips support
AC_MSG_CHECKING(whether to include openssl fips support)
AC_ARG_ENABLE(fips, [  --disable-fips          disable OpenSSL FIPS support],
  [ case "$enableval" in
    no) AC_MSG_RESULT(no); WITH_FIPS= ;;
    *) AC_MSG_RESULT(yes); WITH_FIPS=1 ;;
   esac],
   [ AC_MSG_RESULT(yes);   WITH_FIPS=1 ])

if test -n "$WITH_FIPS"; then
  if test -n "$WITH_OPENSSL"; then
    AC_CHECK_PROG(HAVE_FIPSLD, fipsld, 1)
    if test "$sc_cv_have_openssl_ssl_h" != "yes" -o "$sc_cv_have_libssl" != "yes" -o ! "$HAVE_FIPSLD";
 then
      AC_MSG_WARN([not all components of OpenSSL found, disabling FIPS]);
      WITH_FIPS=
    fi
  else
    AC_MSG_WARN([must enable OpenSSL to enable FIPS; use --enable-openssl]);
  fi
fi

if test -n "$WITH_FIPS"; then
  AC_MSG_NOTICE(checking for components of OpenSSL FIPS)
  # first, we need to find the include file <openssl/fips.h>
  AC_CACHE_VAL(sc_cv_have_openssl_fips_h,
    [AC_TRY_COMPILE([#define OPENSSL_FIPS
#include <openssl/fips.h>],[;],
      [sc_cv_have_openssl_fips_h=yes; ],
      [sv_cv_have_openssl_fips_h=no
        if test -n "$OPENSSL_ROOT"; then
          I="$OPENSSL_ROOT/include"
          i="$I/openssl/fips.h"
          if test -r "$i"; then
            AC_MSG_NOTICE(found $i)
            sc_cv_have_openssl_fips_h=yes;
          fi
        fi
      ]
    )]
  )
  if test "$sv_cv_have_openssl_fips_h" = "yes"; then
    AC_DEFINE(HAVE_OPENSSL_FIPS_H)
  fi
  AC_MSG_NOTICE(checked for openssl/fips.h... $sc_cv_have_openssl_ssl_h)
fi

if test -n "$WITH_FIPS" -a "$sc_cv_have_openssl_fips_h" = 'yes'; then
  # check for the libcrypto library with fips support
  AC_MSG_CHECKING(for libcrypto with FIPS support)
  AC_CACHE_VAL(sc_cv_have_libcrypto,
    [ LIBS0="$LIBS"
      echo $LIBS | grep -q "\-lcrypto"
      if test $? -ne 0; then
        if test -n "$OPENSSL_ROOT"; then
          L="$OPENSSL_ROOT/lib"; LIBS="$LIBS -L$L -lcrypto"
        else
          LIBS="$LIBS -lcrypto"
        fi
      fi
      AC_TRY_LINK([#define OPENSSL_FIPS
#include <openssl/ssl.h>
#include <openssl/fips.h>],
        [int res = FIPS_mode_set(1);],
        [sc_cv_have_libcrypto='yes'],
        [sc_cv_have_libcrypto='no']
      )
      if test "$sc_cv_have_libcrypto" != 'yes'; then
        LIBS="$LIBS0"
      fi
    ]
  )
  if test "$sc_cv_have_libcrypto" = 'yes'; then
    AC_DEFINE(HAVE_LIBCRYPTO)
  fi
  AC_MSG_RESULT($sc_cv_have_libcrypto)
fi

if test -n "$WITH_FIPS"; then
  if test "$sc_cv_have_openssl_fips_h" = 'yes' -a "$sc_cv_have_libcrypto" = 'yes'; then
    AC_DEFINE(WITH_FIPS)
    AC_DEFINE(OPENSSL_FIPS)
  else
    AC_MSG_WARN([not all components of OpenSSL FIPS found, disabling it]);
  fi
fi

AC_MSG_CHECKING(whether to include tun/tap address support)
AC_ARG_ENABLE(tun, [  --disable-tun           disable TUN/TAP support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);  WITH_TUN= ;;
	       *)  AC_MSG_RESULT(yes); WITH_TUN=1 ;;
	       esac],
	       [AC_MSG_RESULT(yes);    WITH_TUN=1 ])

#
if ! test "$ac_cv_header_linux_if_tun_h" = 'yes'; then
  AC_MSG_WARN(include file linux/if_tun.h not found, disabling TUN)
  WITH_TUN=
fi
#
if test -n "$WITH_TUN"; then
  AC_DEFINE(WITH_TUN)
fi

AC_MSG_CHECKING(whether to include system call tracing)
AC_ARG_ENABLE(sycls, [  --disable-sycls         disable system call tracing],
	      [case "$enableval" in
	       no) SYCLS=""; SSLCLS=""; AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_SYCLS)
		 SYCLS="sycls.c"; SSLCLS="sslcls.c"; AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_SYCLS)
		 SYCLS="sycls.c"; SSLCLS="sslcls.c"; AC_MSG_RESULT(yes)])
AC_SUBST(SYCLS)
AC_SUBST(SSLCLS)

AC_MSG_CHECKING(whether to include file descriptor analyzer)
AC_ARG_ENABLE(filan, [  --disable-filan         disable file descriptor analyzer],
	      [case "$enableval" in
	       no) FILAN=""; AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_FILAN) FILAN="filan.c"; AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_FILAN) FILAN="filan.c"; AC_MSG_RESULT(yes)])
AC_SUBST(FILAN)

AC_MSG_CHECKING(whether to include retry support)
AC_ARG_ENABLE(retry, [  --disable-retry         disable retry support],
	      [case "$enableval" in
	       no) AC_MSG_RESULT(no);;
	       *) AC_DEFINE(WITH_RETRY) AC_MSG_RESULT(yes);;
	       esac],
	       [AC_DEFINE(WITH_RETRY) AC_MSG_RESULT(yes)])

AC_MSG_CHECKING(included message level)
AC_ARG_ENABLE(msglevel, [  --enable-msglevel=N     set max verbosity to debug,info,notice,warn,error,fatal],
	      [case "$enableval" in
	       debug) AC_DEFINE(WITH_MSGLEVEL,0) AC_MSG_RESULT(debug);;
	       info)  AC_DEFINE(WITH_MSGLEVEL,1) AC_MSG_RESULT(info);;
	       notice) AC_DEFINE(WITH_MSGLEVEL,2) AC_MSG_RESULT(notice);;
	       warn) AC_DEFINE(WITH_MSGLEVEL,3) AC_MSG_RESULT(warn);;
	       error) AC_DEFINE(WITH_MSGLEVEL,4) AC_MSG_RESULT(error);;
	       fatal) AC_DEFINE(WITH_MSGLEVEL,5) AC_MSG_RESULT(fatal);;
	       *) AC_DEFINE(WITH_MSGLEVEL,0) AC_MSG_RESULT(debug);;
	       esac],
	       [AC_DEFINE(WITH_MSGLEVEL,0) AC_MSG_RESULT(debug)])

#AC_SUBST(V_INCL)

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_UID_T
AC_TYPE_MODE_T
AC_TYPE_OFF_T
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_STRUCT_ST_BLKSIZE
AC_STRUCT_ST_BLOCKS
AC_STRUCT_ST_RDEV
AC_HEADER_TIME

dnl Check for extra realtime library (for Solaris)
AC_CHECK_FUNC(nanosleep, AC_DEFINE(HAVE_NANOSLEEP), AC_CHECK_LIB(rt, nanosleep, [LIBS="-lrt $LIBS"; AC_DEFINE(HAVE_NANOSLEEP)]))
#AC_CHECK_FUNC(nanosleep, , AC_CHECK_LIB(rt, nanosleep))

dnl Checks for library functions.
AC_PROG_GCC_TRADITIONAL
AC_FUNC_MEMCMP
AC_TYPE_SIGNAL
AC_FUNC_STRFTIME
AC_CHECK_FUNCS(putenv select poll socket strdup strerror strstr strtod strtol)
AC_CHECK_FUNCS(strtoul uname getpgid getsid getaddrinfo)
AC_CHECK_FUNCS(getipnodebyname setgroups inet_aton memrchr)
AC_CHECK_FUNCS(if_indextoname)

AC_CHECK_FUNCS(grantpt unlockpt ptsname)


AC_MSG_CHECKING(for long long)
AC_CACHE_VAL(sc_cv_type_longlong,
[AC_TRY_COMPILE([],[long long s;],
[sc_cv_type_longlong=yes],
[sc_cv_type_longlong=no])])
if test $sc_cv_type_longlong = yes; then
   AC_DEFINE(HAVE_TYPE_LONGLONG)
fi
AC_MSG_RESULT($sc_cv_type_longlong)

# following builtin macro does not check unistd.h and sys/socket.h where
# socklen_t might be defined
#AC_CHECK_TYPE(socklen_t, int)
#
AC_MSG_CHECKING(for socklen_t)
AC_CACHE_VAL(sc_cv_type_socklen,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>],[socklen_t s;],
[sc_cv_type_socklen=yes],
[sc_cv_type_socklen=no])])
if test $sc_cv_type_socklen = yes; then
   AC_DEFINE(HAVE_TYPE_SOCKLEN)
fi
AC_MSG_RESULT($sc_cv_type_socklen)

AC_MSG_CHECKING(for struct stat64)
AC_CACHE_VAL(sc_cv_type_stat64,
[AC_TRY_COMPILE([#include <sys/stat.h>],[struct stat64 s;],
[sc_cv_type_stat64=yes],
[sc_cv_type_stat64=no])])
if test $sc_cv_type_stat64 = yes; then
   AC_DEFINE(HAVE_TYPE_STAT64)
fi
AC_MSG_RESULT($sc_cv_type_stat64)

AC_MSG_CHECKING(for off64_t)
AC_CACHE_VAL(sc_cv_type_off64,
[AC_TRY_COMPILE([#include <unistd.h>],[off64_t s;],
[sc_cv_type_off64=yes],
[sc_cv_type_off64=no])])
if test $sc_cv_type_off64 = yes; then
   AC_DEFINE(HAVE_TYPE_OFF64)
fi
AC_MSG_RESULT($sc_cv_type_off64)

AC_MSG_CHECKING(for sighandler_t)
AC_CACHE_VAL(sc_cv_type_sighandler,
[AC_TRY_COMPILE([#include <signal.h>],[sighandler_t s;],
[sc_cv_type_sighandler=yes],
[sc_cv_type_sighandler=no])])
if test $sc_cv_type_sighandler = yes; then
   AC_DEFINE(HAVE_TYPE_SIGHANDLER)
fi
AC_MSG_RESULT($sc_cv_type_socklen)

AC_MSG_CHECKING(for uint8_t)
AC_CACHE_VAL(sc_cv_type_uint8,
[AC_TRY_COMPILE([#include <sys/types.h>
#if HAVE_STDINT_H
#include <stdint.h>
#endif
/* Tru64 has uint8_t etc from netdb.h */
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <unistd.h>],[uint8_t s;],
[sc_cv_type_uint8=yes],
[sc_cv_type_uint8=no])])
if test $sc_cv_type_uint8 = yes; then
   AC_DEFINE(HAVE_TYPE_UINT8)
fi
AC_MSG_RESULT($sc_cv_type_uint8)

AC_MSG_CHECKING(for uint16_t)
AC_CACHE_VAL(sc_cv_type_uint16,
[AC_TRY_COMPILE([#include <sys/types.h>
#if HAVE_STDINT_H
#include <stdint.h>
#endif
/* Tru64 has uint16_t etc from netdb.h */
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <unistd.h>],[uint16_t s;],
[sc_cv_type_uint16=yes],
[sc_cv_type_uint16=no])])
if test $sc_cv_type_uint16 = yes; then
   AC_DEFINE(HAVE_TYPE_UINT16)
fi
AC_MSG_RESULT($sc_cv_type_uint16)

AC_MSG_CHECKING(for uint32_t)
AC_CACHE_VAL(sc_cv_type_uint32,
[AC_TRY_COMPILE([#include <sys/types.h>
#if HAVE_STDINT_H
#include <stdint.h>
#endif
/* Tru64 has uint32_t etc from netdb.h */
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <unistd.h>],[uint32_t s;],
[sc_cv_type_uint32=yes],
[sc_cv_type_uint32=no])])
if test $sc_cv_type_uint32 = yes; then
   AC_DEFINE(HAVE_TYPE_UINT32)
fi
AC_MSG_RESULT($sc_cv_type_uint32)

AC_MSG_CHECKING(for uint64_t)
AC_CACHE_VAL(sc_cv_type_uint64,
[AC_TRY_COMPILE([#include <sys/types.h>
#if HAVE_STDINT_H
#include <stdint.h>
#endif
/* Tru64 has uint32_t etc from netdb.h */
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#include <unistd.h>],[uint64_t s;],
[sc_cv_type_uint64=yes],
[sc_cv_type_uint64=no])])
if test $sc_cv_type_uint64 = yes; then
   AC_DEFINE(HAVE_TYPE_UINT64)
fi
AC_MSG_RESULT($sc_cv_type_uint64)

### AIX 4.1 needs _XOPEN_EXTENDED_SOURCE for syslog headers,
# but then gets problems with 3rd arg of getsockaddr...
#AC_MSG_CHECKING(for _XOPEN_EXTENDED_SOURCE requirement)
#CFLAGS="-Werror -Wall"
#AC_TRY_COMPILE([#include <sys/syslog.h>],
#[syslog(0," ");],
#[AC_MSG_RESULT(no)],
#[AC_MSG_RESULT(required); AC_DEFINE(_XOPEN_EXTENDED_SOURCE)])


### fds_bits

AC_MSG_CHECKING(for fdset->fds_bits)
AC_TRY_COMPILE([#include <sys/types.h>
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif],
[fd_set s; s.fds_bits[0]=0;],
[AC_MSG_RESULT(yes); AC_DEFINE(HAVE_FDS_BITS)],
[AC_MSG_RESULT(no);])

AC_MSG_CHECKING(for sa_family_t)
AC_CACHE_VAL(sc_cv_type_sa_family_t,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>],[sa_family_t s;],
[sc_cv_type_sa_family_t=yes],
[sc_cv_type_sa_family_t=no])])
if test $sc_cv_type_sa_family_t = yes; then
   AC_DEFINE(HAVE_TYPE_SA_FAMILY_T)
fi
AC_MSG_RESULT($sc_cv_type_sa_family_t)

AC_MSG_CHECKING(for struct sigaction.sa_sigaction)
AC_CACHE_VAL(sc_cv_struct_sigaction_sa_sigaction,
[AC_TRY_COMPILE([#include <signal.h>],[struct sigaction s;s.sa_sigaction=0;],
[sc_cv_struct_sigaction_sa_sigaction=yes],
[sc_cv_struct_sigaction_sa_sigaction=no])])
if test $sc_cv_struct_sigaction_sa_sigaction = yes; then
   AC_DEFINE(HAVE_STRUCT_SIGACTION_SA_SIGACTION)
fi
AC_MSG_RESULT($sc_cv_struct_sigaction_sa_sigaction)

### struct termios .c_ispeed
AC_MSG_CHECKING(for termios.c_ispeed)
AC_CACHE_VAL(sc_cv_termios_ispeed,
[AC_TRY_COMPILE([#include <termios.h>],
[struct termios t; t.c_ispeed=0;],
[sc_cv_termios_ispeed=yes],
[sc_cv_termios_ispeed=no])])
if test $sc_cv_termios_ispeed = yes; then
   AC_DEFINE(HAVE_TERMIOS_ISPEED)
fi
AC_MSG_RESULT($sc_cv_termios_ispeed)

if test $sc_cv_termios_ispeed = yes; then
AC_MSG_CHECKING(for offset of c_ispeed in struct termios)
LIBS1="$LIBS"; LIBS=""	# avoid libwrap allow_severity undefined
AC_CACHE_VAL(ac_cv_ispeed_offset,
 [conftestspeedoff="conftestspeedoff.out"
 AC_TRY_RUN([
  #include <errno.h>
  #include <stdio.h>
  #include <termios.h>
  #include <string.h>
  main(){
    struct termios t;
    FILE *f;
    if ((f=fopen("$conftestspeedoff","w"))==NULL){
       fprintf(stderr,"\\"$conftestspeedoff\\": %s\n",strerror(errno)); exit(-1);
    }
    fprintf(f, "%d", ((char*)&t.c_ispeed-(char*)&t)/sizeof(speed_t));
    exit(0);
 }
 ],
 [ac_cv_ispeed_offset=`cat $conftestspeedoff`],
 [ac_cv_ispeed_offset=-1],
 [ac_cv_ispeed_offset=-1]	#!
)])
LIBS="$LIBS1"
AC_MSG_RESULT($ac_cv_ispeed_offset)
 if test $ac_cv_ispeed_offset -ge 0; then
   AC_DEFINE_UNQUOTED(ISPEED_OFFSET, $ac_cv_ispeed_offset)
 fi
fi

# there is another issue with termios: OSR requires "#define _SVID3 ..."
# for reasonable termios support. We check this situation using IMAXBEL
AC_MSG_CHECKING(if _SVID3 is helpful)
AC_CACHE_VAL(ac_cv_svid3,
 [AC_TRY_COMPILE([#include <termios.h>],
 [int i=IMAXBEL],
 [ac_cv_svid3=no],
 [AC_TRY_COMPILE([#define _SVID3 1
#include <termios.h>],
   [int i=IMAXBEL],
   [ac_cv_svid3=yes],
   [ac_cv_svid3=no]
 )]
)])
if test $ac_cv_svid3 = yes; then
  AC_DEFINE(_SVID3)
fi
AC_MSG_RESULT($ac_cv_svid3)

 
# struct timespec
AC_MSG_CHECKING(for struct timespec)
AC_CACHE_VAL(sc_cv_struct_timespec,
[AC_TRY_COMPILE([#include <time.h>
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif],[struct timespec s;],
[sc_cv_struct_timespec=yes],
[sc_cv_struct_timespec=no])])
if test $sc_cv_struct_timespec = yes; then
   AC_DEFINE(HAVE_STRUCT_TIMESPEC)
fi
AC_MSG_RESULT($sc_cv_struct_timespec)


# struct linger; FreeBSD requires sys/types.h for sys/socket.h
AC_MSG_CHECKING(for struct linger)
AC_CACHE_VAL(sc_cv_struct_linger,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>],[struct linger s;],
[sc_cv_struct_linger=yes],
[sc_cv_struct_linger=no])])
if test $sc_cv_struct_linger = yes; then
   AC_DEFINE(HAVE_STRUCT_LINGER)
fi
AC_MSG_RESULT($sc_cv_struct_linger)


# struct ip_mreq (for multicasting options)
AC_MSG_CHECKING(for struct ip_mreq)
AC_CACHE_VAL(sc_cv_struct_ip_mreq,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>],[struct ip_mreq s;],
[sc_cv_struct_ip_mreq=yes],
[sc_cv_struct_ip_mreq=no])])
if test $sc_cv_struct_ip_mreq = yes; then
   AC_DEFINE(HAVE_STRUCT_IP_MREQ)
fi
AC_MSG_RESULT($sc_cv_struct_ip_mreq)

# struct ip_mreqn (for multicasting options)
AC_MSG_CHECKING(for struct ip_mreqn)
AC_CACHE_VAL(sc_cv_struct_ip_mreqn,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/ip.h>],[struct ip_mreqn s;],
[sc_cv_struct_ip_mreqn=yes],
[sc_cv_struct_ip_mreqn=no])])
if test $sc_cv_struct_ip_mreqn = yes; then
   AC_DEFINE(HAVE_STRUCT_IP_MREQN)
fi
AC_MSG_RESULT($sc_cv_struct_ip_mreqn)

# struct ipv6_mreq (for multicasting options)
AC_MSG_CHECKING(for struct ipv6_mreq)
AC_CACHE_VAL(sc_cv_struct_ipv6_mreq,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>],[struct ipv6_mreq s;],
[sc_cv_struct_ipv6_mreq=yes],
[sc_cv_struct_ipv6_mreq=no])])
if test $sc_cv_struct_ipv6_mreq = yes; then
   AC_DEFINE(HAVE_STRUCT_IPV6_MREQ)
fi
AC_MSG_RESULT($sc_cv_struct_ipv6_mreq)


# struct ifreq (for network interfaces)
AC_MSG_CHECKING(for struct ifreq)
AC_CACHE_VAL(sc_cv_struct_ifreq,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>],[struct ifreq s;],
[sc_cv_struct_ifreq=yes],
[sc_cv_struct_ifreq=no])])
if test $sc_cv_struct_ifreq = yes; then
   AC_DEFINE(HAVE_STRUCT_IFREQ)
fi
AC_MSG_RESULT($sc_cv_struct_ifreq)

# struct ifreq.ifr_index
# on most systems that have struct ifreq
AC_MSG_CHECKING(for struct ifreq.ifr_index)
AC_CACHE_VAL(sc_cv_struct_ifreq_ifr_index,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>],
[struct ifreq ir;ir.ifr_index=0;],
[sc_cv_struct_ifreq_ifr_index=yes],
[sc_cv_struct_ifreq_ifr_index=no])])
if test $sc_cv_struct_ifreq_ifr_index = yes; then
   AC_DEFINE(HAVE_STRUCT_IFREQ_IFR_INDEX)
fi
AC_MSG_RESULT($sc_cv_struct_ifreq_ifr_index)

# struct ifreq.ifr_ifindex
# Linux has ifr_ifindex instead of ifr_index
AC_MSG_CHECKING(for struct ifreq.ifr_ifindex)
AC_CACHE_VAL(sc_cv_struct_ifreq_ifr_ifindex,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>],
[struct ifreq ir;ir.ifr_ifindex=0;],
[sc_cv_struct_ifreq_ifr_ifindex=yes],
[sc_cv_struct_ifreq_ifr_ifindex=no])])
if test $sc_cv_struct_ifreq_ifr_ifindex = yes; then
   AC_DEFINE(HAVE_STRUCT_IFREQ_IFR_IFINDEX)
fi
AC_MSG_RESULT($sc_cv_struct_ifreq_ifr_ifindex)


# some systems have a sa_len field in struct sockaddr and we need to support it
# so we can compare sockaddrs simply with memcmp
AC_MSG_CHECKING(for struct sockaddr.sa_len)
AC_CACHE_VAL(sc_cv_struct_sockaddr_salen,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>],
[struct sockaddr sa;sa.sa_len=0;],
[sc_cv_struct_sockaddr_salen=yes],
[sc_cv_struct_sockaddr_salen=no])])
if test $sc_cv_struct_sockaddr_salen = yes; then
   AC_DEFINE(HAVE_STRUCT_SOCKADDR_SALEN)
fi
AC_MSG_RESULT($sc_cv_struct_sockaddr_salen)

### IP6 sockaddr_in6

AC_MSG_CHECKING(for component names of sockaddr_in6)
AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
[struct sockaddr_in6 sa6;sa6.sin6_addr.s6_addr[0]=0;],
[AC_MSG_RESULT(s6_addr);
 AC_DEFINE(HAVE_IP6_SOCKADDR, 0)],
[AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
 [struct sockaddr_in6 sa6;sa6.sin6_addr.u6_addr.u6_addr16[0]=0;],
 [AC_MSG_RESULT(u6_addr.u6_addr16);
  AC_DEFINE(HAVE_IP6_SOCKADDR, 1)],
 [AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
  [struct sockaddr_in6 sa6;sa6.sin6_addr.u6_addr16[0]=0;],
  [AC_MSG_RESULT(u6_addr16); AC_DEFINE(HAVE_IP6_SOCKADDR, 2)],
  [AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
   [struct sockaddr_in6 sa6;sa6.sin6_addr.in6_u.u6_addr16[0]=0;],
   [AC_MSG_RESULT(in6_u.u6_addr16);
    AC_DEFINE(HAVE_IP6_SOCKADDR, 3)],
   [AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
    [struct sockaddr_in6 sa6;sa6.sin6_addr._S6_un._S6_u32[0]=0;],
    [AC_MSG_RESULT(_S6_un._S6_u32);
     AC_DEFINE(HAVE_IP6_SOCKADDR, 4)],
    [AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in.h>],
     [struct sockaddr_in6 sa6;sa6.sin6_addr.__u6_addr.__u6_addr32[0]=0;],
     [AC_MSG_RESULT(__u6_addr.__u6_addr32);
      AC_DEFINE(HAVE_IP6_SOCKADDR, 5)],

    [AC_MSG_RESULT([none or unknown])]
)])])])])])

dnl Check for struct iovec
AC_MSG_CHECKING(for struct iovec)
AC_CACHE_VAL(sc_cv_struct_iovec,
[AC_TRY_COMPILE([#include <sys/uio.h>],[struct iovec s;],
[sc_cv_struct_iovec=yes],
[sc_cv_struct_iovec=no])])
if test $sc_cv_struct_iovec = yes; then
   AC_DEFINE(HAVE_STRUCT_IOVEC)
fi
AC_MSG_RESULT($sc_cv_struct_iovec)

dnl check for msg_control in struct msghdr
AC_MSG_CHECKING(for struct msghdr.msg_control)
AC_CACHE_VAL(sc_cv_struct_msghdr_msgcontrol,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>],
[struct msghdr s;s.msg_control=0;],
[sc_cv_struct_msghdr_msgcontrol=yes],
[sc_cv_struct_msghdr_msgcontrol=no])])
if test $sc_cv_struct_msghdr_msgcontrol = yes; then
   AC_DEFINE(HAVE_STRUCT_MSGHDR_MSGCONTROL)
fi
AC_MSG_RESULT($sc_cv_struct_msghdr_msgcontrol)

dnl check for msg_controllen in struct msghdr
AC_MSG_CHECKING(for struct msghdr.msg_controllen)
AC_CACHE_VAL(sc_cv_struct_msghdr_msgcontrollen,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>],
[struct msghdr s;s.msg_controllen=0;],
[sc_cv_struct_msghdr_msgcontrollen=yes],
[sc_cv_struct_msghdr_msgcontrollen=no])])
if test $sc_cv_struct_msghdr_msgcontrollen = yes; then
   AC_DEFINE(HAVE_STRUCT_MSGHDR_MSGCONTROLLEN)
fi
AC_MSG_RESULT($sc_cv_struct_msghdr_msgcontrollen)

dnl check for msg_flags in struct msghdr
AC_MSG_CHECKING(for struct msghdr.msgflags)
AC_CACHE_VAL(sc_cv_struct_msghdr_msgflags,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>],
[struct msghdr s;s.msg_flags=0;],
[sc_cv_struct_msghdr_msgflags=yes],
[sc_cv_struct_msghdr_msgflags=no])])
if test $sc_cv_struct_msghdr_msgflags = yes; then
   AC_DEFINE(HAVE_STRUCT_MSGHDR_MSGFLAGS)
fi
AC_MSG_RESULT($sc_cv_struct_msghdr_msgflags)

dnl check for struct cmsghdr
AC_MSG_CHECKING(for struct cmsghdr)
AC_CACHE_VAL(sc_cv_struct_cmsghdr,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>],[struct cmsghdr s;],
[sc_cv_struct_cmsghdr=yes],
[sc_cv_struct_cmsghdr=no])])
if test $sc_cv_struct_cmsghdr = yes; then
   AC_DEFINE(HAVE_STRUCT_CMSGHDR)
fi
AC_MSG_RESULT($sc_cv_struct_cmsghdr)

dnl check for struct in_pktinfo
AC_MSG_CHECKING(for struct in_pktinfo)
AC_CACHE_VAL(sc_cv_struct_in_pktinfo,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>],[struct in_pktinfo s;],
[sc_cv_struct_in_pktinfo=yes],
[sc_cv_struct_in_pktinfo=no])])
if test $sc_cv_struct_in_pktinfo = yes; then
   AC_DEFINE(HAVE_STRUCT_IN_PKTINFO)
fi
AC_MSG_RESULT($sc_cv_struct_in_pktinfo)

if test $sc_cv_struct_in_pktinfo = 'yes'; then
   dnl check for component ipi_spec_dst in struct in_pktinfo
   AC_MSG_CHECKING(for ipi_spec_dst in struct in_pktinfo)
   AC_CACHE_VAL(sc_cv_pktinfo_ipi_spec_dst,
   [AC_TRY_COMPILE([#include <sys/types.h>
   #include <sys/socket.h>
   #include <netinet/in.h>],[struct in_pktinfo s; s.ipi_spec_dst],
   [sc_cv_pktinfo_ipi_spec_dst=yes],
   [sc_cv_pktinfo_ipi_spec_dst=no])])
   if test $sc_cv_pktinfo_ipi_spec_dst = yes; then
      AC_DEFINE(HAVE_PKTINFO_IPI_SPEC_DST)
   fi
   AC_MSG_RESULT($sc_cv_pktinfo_ipi_spec_dst)
fi

dnl check for ip_hl in struct ip
AC_MSG_CHECKING(for struct ip.ip_hl)
AC_CACHE_VAL(sc_cv_struct_ip_ip_hl,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>],
[struct ip s;s.ip_hl=0;],
[sc_cv_struct_ip_ip_hl=yes],
[sc_cv_struct_ip_ip_hl=no])])
if test $sc_cv_struct_ip_ip_hl = yes; then
   AC_DEFINE(HAVE_STRUCT_IP_IP_HL)
fi
AC_MSG_RESULT($sc_cv_struct_ip_ip_hl)


dnl Library function checks

dnl Check sigaction()
AC_CHECK_FUNC(sigaction, AC_DEFINE(HAVE_SIGACTION))

dnl Check for 64bit versions of system calls
AC_CHECK_FUNC(stat64, AC_DEFINE(HAVE_STAT64))
AC_CHECK_FUNC(fstat64, AC_DEFINE(HAVE_FSTAT64))
AC_CHECK_FUNC(lstat64, AC_DEFINE(HAVE_LSTAT64))
AC_CHECK_FUNC(lseek64, AC_DEFINE(HAVE_LSEEK64))
AC_CHECK_FUNC(truncate64, AC_DEFINE(HAVE_TRUNCATE64))
AC_CHECK_FUNC(ftruncate64, AC_DEFINE(HAVE_FTRUNCATE64))

AC_CHECK_FUNC(strtoll, AC_DEFINE(HAVE_STRTOLL))
AC_CHECK_FUNC(hstrerror, AC_DEFINE(HAVE_HSTRERROR))
AC_CHECK_FUNC(inet_ntop, AC_DEFINE(HAVE_INET_NTOP))

#if test "$ac_cv_func_hstrerror" = "yes"; then
#  AC_MSG_CHECKING(if _XOPEN_SOURCE_EXTENDED is helpful)
#  AC_CACHE_VAL(ac_cv_xopen_source_extended,
#   [AC_TRY_COMPILE([#include <netdb.h>],
#   [hstrerror()],
#   [ac_cv_xopen_source_extended=no],
#   [AC_TRY_COMPILE([#define _XOPEN_SOURCE_EXTENDED 1
##  include <netdb.h>],
#     [hstrerror()],
#     [ac_cv_xopen_source_extended=yes],
#     [ac_cv_xopen_source_extended=no]
#   )]
#  )])
#  if test $ac_cv_xopen_source_extended = yes; then
#    AC_DEFINE(_XOPEN_SOURCE_EXTENDED)
#  fi
#  AC_MSG_RESULT($ac_cv_xopen_source_extended)
#fi

dnl Search for openpty()
# MacOS
AC_CHECK_FUNC(openpty, AC_DEFINE(HAVE_OPENPTY))
# AIX
AC_CHECK_LIB(bsd, openpty,
  [LIBS="-lbsd $LIBS"; AC_DEFINE(HAVE_OPENPTY)])
# Linux 2.4
AC_CHECK_LIB(util, openpty,
  [LIBS="-lutil $LIBS"; AC_DEFINE(HAVE_OPENPTY)])

dnl Search for flock()
# with Linux it's in libc, with AIX in libbsd
AC_CHECK_FUNC(flock, AC_DEFINE(HAVE_FLOCK),
	AC_CHECK_LIB(bsd, flock, [LIBS="-lbsd $LIBS"]))

dnl Search for setenv()
AC_CHECK_FUNC(setenv, AC_DEFINE(HAVE_SETENV),
	AC_CHECK_LIB(isode, setenv, [LIBS="-lisode $LIBS"]))

dnl Search for unsetenv()
AC_CHECK_FUNC(unsetenv, AC_DEFINE(HAVE_UNSETENV))


dnl Run time checks


AC_MSG_CHECKING(if printf has Z modifier)
AC_CACHE_VAL(ac_cv_have_z_modifier,
[AC_TRY_RUN([
#include <stdio.h>
main(){
char s[16];
sprintf(s,"%Zu",1);
exit(strcmp(s,"1"));
}],
[ac_cv_have_z_modifier=yes],
[ac_cv_have_z_modifier=no],
[ac_cv_have_z_modifier=no])])
if test $ac_cv_have_z_modifier = yes; then
   AC_DEFINE(HAVE_FORMAT_Z)
fi
AC_MSG_RESULT($ac_cv_have_z_modifier)


dnl find the number of bits we must shift a value to match the given mask
dnl (e.g., mask 0x00f0 requires shifting with 4)
## NOTE: some platforms only need one '\' to escape '"' in string constant
define(AC_SHIFT_OFFSET,[
AC_CACHE_CHECK(shift offset of $1, $2,
[LIBS1="$LIBS"; LIBS=""	# avoid libwrap allow_severity undefined
 conftestoffset="conftestoffset.out"
 AC_TRY_RUN([
 #include <errno.h>
 #include <stdio.h>
 #include <termios.h>
 #include <string.h>
 main(){
    unsigned int i,n=$1;
    FILE *f;
    if ((f=fopen("$conftestoffset","w"))==NULL){
       fprintf(stderr,"\\"$conftestoffset\\": %s\n",strerror(errno)); exit(-1);
    }
    if (n==0) {fprintf(stderr,"$1 is 0 (impossible!)\n"); exit(1);}
    i=0; while (!(n&1)) {
       n>>=1; ++i; }
    if (3<<i == $1) {
       fprintf(f, "%u", i);
    } else {
       fprintf(f, "-1");	/* anticipate result of xioinitialize assert */
    }
    exit(0);
 }
 ],
 [$2=`cat $conftestoffset`],
 [$2=-1],
 [$2=-1]
)
 LIBS="$LIBS1"])
AC_DEFINE_UNQUOTED($1_SHIFT, ${$2})
if test "$2" = -1; then
AC_MSG_WARN(please determine $1_SHIFT manually)
fi
])

AC_SHIFT_OFFSET(CRDLY,  sc_cv_sys_crdly_shift)
AC_SHIFT_OFFSET(TABDLY, sc_cv_sys_tabdly_shift)
AC_SHIFT_OFFSET(CSIZE,  sc_cv_sys_csize_shift)


dnl find what physical type (basic C type) is equivalent to the given type.
dnl arg1: include file(s)
dnl arg2: type name
dnl arg3: output variable
dnl arg4: cache variable (might be constructed automatically)
dnl   output values: 1..short, 2..unsigned short, 3..int, 4..u-int,
dnl                  5..long, 6..u-long; others not yet supported
define(AC_BASIC_TYPE,[
AC_CACHE_CHECK(for equivalent simple type of $2, $4,
[CFLAGS1="$CFLAGS"; CFLAGS="$ERRONWARN $(echo "$CFLAGS1" | sed -e 's@-Wall@@g')"
 AC_TRY_COMPILE([$1],[$2 u; short v; &u==&v;],
 [$4="1 /* short */"],
 [AC_TRY_COMPILE([$1],[$2 u; unsigned short v; &u==&v;],
  [$4="2 /* unsigned short */"],
  [AC_TRY_COMPILE([$1],[$2 u; int v; &u==&v;],
   [$4="3 /* int */"],
   [AC_TRY_COMPILE([$1],[$2 u; unsigned int v; &u==&v;],
    [$4="4 /* unsigned int */"],
    [AC_TRY_COMPILE([$1],[$2 u; long v; &u==&v;],
     [$4="5 /* long */"],
     [AC_TRY_COMPILE([$1],[$2 u; unsigned long v; &u==&v;],
      [$4="6 /* unsigned long */"],
      [AC_TRY_COMPILE([$1],[$2 u; long long v; &u==&v;],
       [$4="7 /* long long */"],
       [AC_TRY_COMPILE([$1],[$2 u; unsigned long long v; &u==&v;],
        [$4="8 /* unsigned long long */"],
        [$4="0 /* unknown, taking default */"
]) ]) ]) ]) ]) ]) ]) ])
 CFLAGS="$CFLAGS1" ])
AC_DEFINE_UNQUOTED($3, ${$4})
])

dnl find what physical type (basic C type) describes the given struct or union
dnl component.
dnl arg1: include file(s); must declare the structure type
dnl arg2: struct name (e.g., "struct stat")
dnl arg3: variable or component (e.g., "st_ino")
dnl arg4: output variable, values see AC_BASIC_TYPE
dnl arg5: cache variable (might be constructed automatically)
define(AC_TYPEOF_COMPONENT,[
AC_CACHE_CHECK(for basic type of $2.$3, $5,
[CFLAGS1="$CFLAGS"; CFLAGS="$ERRONWARN $(echo "$CFLAGS1" | sed -e 's@-Wall@@g')"
AC_TRY_COMPILE([$1],[$2 u;short v; &u.$3==&v;],
[$5="1 /* short */"],
[AC_TRY_COMPILE([$1],[$2 u; unsigned short v; &u.$3==&v;],
 [$5="2 /* unsigned short */"],
 [AC_TRY_COMPILE([$1],[$2 u; int v; &u.$3==&v;],
  [$5="3 /* int */"],
  [AC_TRY_COMPILE([$1],[$2 u; unsigned int v; &u.$3==&v;],
   [$5="4 /* unsigned int */"],
   [AC_TRY_COMPILE([$1],[$2 u; long v; &u.$3==&v;],
    [$5="5 /* long */"],
    [AC_TRY_COMPILE([$1],[$2 u; unsigned long v; &u.$3==&v;],
     [$5="6 /* unsigned long */"],
     [AC_TRY_COMPILE([$1],[$2 u; long long v; &u.$3==&v;],
      [$5="7 /* long long */"],
      [AC_TRY_COMPILE([$1],[$2 u; unsigned long long v; &u.$3==&v;],
       [$5="8 /* unsigned long long */"],
       [$5="0 /* unknown, taking default */"
]) ]) ]) ]) ]) ]) ]) ])
 CFLAGS="$CFLAGS1" ])
AC_DEFINE_UNQUOTED($4, ${$5})
])

AC_BASIC_TYPE([#include <stdlib.h>], size_t, HAVE_BASIC_SIZE_T, sc_cv_type_sizet_basic)
AC_BASIC_TYPE([#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>], mode_t, HAVE_BASIC_MODE_T, sc_cv_type_modet_basic)
AC_BASIC_TYPE([#include <sys/types.h>
#include <unistd.h>], pid_t, HAVE_BASIC_PID_T, sc_cv_type_pidt_basic)
AC_BASIC_TYPE([#include <sys/types.h>
#include <unistd.h>], uid_t, HAVE_BASIC_UID_T, sc_cv_type_uidt_basic)
AC_BASIC_TYPE([#include <sys/types.h>
#include <unistd.h>], gid_t, HAVE_BASIC_GID_T, sc_cv_type_gidt_basic)

AC_BASIC_TYPE([#include <time.h>], time_t, HAVE_BASIC_TIME_T,
	sc_cv_type_timet_basic)

# this is questionable, might fail on some systems
AC_BASIC_TYPE([#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>], socklen_t, HAVE_BASIC_SOCKLEN_T,
	sc_cv_type_socklent_basic)

AC_BASIC_TYPE([#include <sys/types.h>
#include <unistd.h>], off_t, HAVE_BASIC_OFF_T, sc_cv_type_off_basic)

AC_BASIC_TYPE([#include <sys/types.h>
#include <unistd.h>], off64_t, HAVE_BASIC_OFF64_T, sc_cv_type_off64_basic)

# oh god, __dev_t in Linux 2.4 is struct{int[2];}, not handled here yet.
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_dev, HAVE_TYPEOF_ST_DEV, sc_cv_type_stat_stdev_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_ino, HAVE_TYPEOF_ST_INO, sc_cv_type_stat_stino_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_nlink, HAVE_TYPEOF_ST_NLINK, sc_cv_type_stat_stnlink_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_size, HAVE_TYPEOF_ST_SIZE, sc_cv_type_stat_stsize_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_blksize, HAVE_TYPEOF_ST_BLKSIZE, sc_cv_type_stat_stblksize_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat, st_blocks, HAVE_TYPEOF_ST_BLOCKS, sc_cv_type_stat_stblocks_basic)
#
if test "$ac_cv_func_stat64" = yes; then
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_dev, HAVE_TYPEOF_ST64_DEV, sc_cv_type_stat64_stdev_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_ino, HAVE_TYPEOF_ST64_INO, sc_cv_type_stat64_stino_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_nlink, HAVE_TYPEOF_ST64_NLINK, sc_cv_type_stat64_stnlink_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_size, HAVE_TYPEOF_ST64_SIZE, sc_cv_type_stat64_stsize_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_blksize, HAVE_TYPEOF_ST64_BLKSIZE, sc_cv_type_stat64_stblksize_basic)
AC_TYPEOF_COMPONENT([#include <sys/stat.h>], struct stat64, st_blocks, HAVE_TYPEOF_ST64_BLOCKS, sc_cv_type_stat64_stblocks_basic)
fi

AC_TYPEOF_COMPONENT([#include <sys/time.h>], struct timeval, tv_usec, HAVE_TYPEOF_STRUCT_TIMEVAL_TV_USEC, sc_cv_type_struct_timeval_tv_usec)

AC_TYPEOF_COMPONENT([#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>],
struct rlimit, rlim_max, HAVE_TYPEOF_RLIM_MAX, sc_cv_type_rlimit_rlimmax_basic)

### snprintf, vsnprintf


AC_MSG_CHECKING(for /dev/ptmx)
if test -c /dev/ptmx; then
  AC_DEFINE(HAVE_DEV_PTMX, 1)
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
  AC_MSG_CHECKING(for /dev/ptc)
  if test -c /dev/ptc; then
    AC_DEFINE(HAVE_DEV_PTC)
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi
fi

AC_MSG_CHECKING(for /proc)
if test -d /proc; then
  AC_DEFINE(HAVE_PROC_DIR, 1)
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_MSG_CHECKING(for /proc/*/fd)
if test -d /proc/$$/fd; then
  AC_DEFINE(HAVE_PROC_DIR_FD, 1)
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

dnl "tcpd" "tcpwrappers"
# on some platforms, raw linking with libwrap fails because allow_severity and
# deny_severity are not explicitely defined. Thus we put the libwrap part to
# the end
AC_MSG_CHECKING(whether to include libwrap support)
AC_ARG_ENABLE(libwrap, [  --disable-libwrap       disable libwrap support],
  [ case "$enableval" in
    no) AC_MSG_RESULT(no); WITH_LIBWRAP= ;;
    *) AC_MSG_RESULT(yes); WITH_LIBWRAP=1 ;;
   esac],
   [ AC_MSG_RESULT(yes);   WITH_LIBWRAP=1 ])
#
# check if we find the components of libwrap ("tcpd" "tcpwrappers")
if test -n "$WITH_LIBWRAP"; then
  AC_MSG_NOTICE(checking for components of libwrap)
  # first, we need to find the include file <tcpd.h>
  AC_CACHE_VAL(sc_cv_have_tcpd_h,
    [AC_TRY_COMPILE([#include <sys/types.h>
#include <tcpd.h>],[;],
      [sc_cv_have_tcpd_h=yes; LIBWRAP_ROOT=""],
      [sc_cv_have_tcpd_h=no
       for D in "/sw" "/usr/local" "/opt/freeware" "/usr/sfw"; do
	I="$D/include"
	i="$I/tcpd.h"
	if test -r "$i"; then
	  #V_INCL="$V_INCL -I$I"
	  CPPFLAGS="$CPPFLAGS -I$I"
	  AC_MSG_NOTICE(found $i)
	  sc_cv_have_tcpd_h=yes; LIBWRAP_ROOT="$D"
	  break;
	fi
      done])
  ])
  if test "$sc_cv_have_tcpd_h" = "yes"; then
    AC_DEFINE(HAVE_TCPD_H)
  fi
  AC_MSG_NOTICE(checked for tcpd.h... $sc_cv_have_tcpd_h)
fi	# end checking for tcpd.h
if test -n "$WITH_LIBWRAP" -a "$sc_cv_have_tcpd_h" = yes; then
  # next, we search for the wrap library (libwrap.*)
  AC_MSG_CHECKING(for libwrap)
  AC_CACHE_VAL(sc_cv_have_libwrap,
    [ LIBS0="$LIBS"
      if test -n "$LIBWRAP_ROOT"; then
	L="$LIBWRAP_ROOT/lib"; LIBS="-L$L -lwrap $LIBS"
      else
	LIBS="-lwrap $LIBS"
      fi
      AC_TRY_LINK([#include <sys/types.h>
#include <tcpd.h>
int allow_severity,deny_severity;],[hosts_access(0)],
      [sc_cv_have_libwrap='yes'],
      [sc_cv_have_libwrap='no'
	LIBS="$LIBS -lnsl"	# RedHat73
	AC_TRY_LINK([#include <sys/types.h>
#include <tcpd.h>
int allow_severity,deny_severity;],[hosts_access(0)],
      	  [sc_cv_have_libwrap='yes'],
	  [sc_cv_have_libwrap='no'])
      ]
      )
      if test "$sc_cv_have_libwrap" != 'yes'; then
	LIBS="$LIBS0"
      fi
    ]
  )
  if test "$sc_cv_have_libwrap" = 'yes'; then
    AC_DEFINE(HAVE_LIBWRAP)
  fi
  AC_MSG_RESULT($sc_cv_have_libwrap)
fi
#
if test -n "$WITH_LIBWRAP"; then
  if test "$sc_cv_have_tcpd_h" = "yes" -a "$sc_cv_have_libwrap" = "yes"; then
    AC_DEFINE(WITH_LIBWRAP)
  else
    AC_MSG_WARN([not all components of tcp wrappers found, disabling it]);
  fi
fi

# check of hosts_allow_table
if test -n "$WITH_LIBWRAP"; then
  AC_MSG_CHECKING(checking for hosts_allow_table)
  AC_CACHE_VAL(sc_cv_have_hosts_allow_table,
    [AC_TRY_COMPILE([#include <sys/types.h>
#include <tcpd.h>],[hosts_allow_table="";],
      [sc_cv_have_hosts_allow_table=yes],
      [sc_cv_have_hosts_allow_table=no])])
  if test $sc_cv_have_hosts_allow_table = yes; then
    AC_DEFINE(HAVE_HOSTS_ALLOW_TABLE)
  fi
  AC_MSG_RESULT($sc_cv_have_hosts_allow_table)
fi # test -n "$WITH_LIBWRAP"
  

if test "$GCC" = yes; then
   CFLAGS="$CFLAGS"
fi

# FIPS support requires compiling with fipsld.
# fipsld requires the FIPSLD_CC variable to be set to the original CC.
# This check must be done after all other checks that require compiling
# so that fipsld is not used by the configure script itself.
if test -n "$WITH_FIPS"; then
  if test "$sc_cv_have_openssl_fips_h" = 'yes' -a "$sc_cv_have_libcrypto" = 'yes'; then
    FIPSLD_CC=$CC
    if test "${FIPSLD+set}" != set ; then
        FIPSLD=fipsld
    fi
    CC="FIPSLD_CC=$CC $FIPSLD"
  fi
fi
AC_SUBST(FIPSLD_CC)

AC_OUTPUT(Makefile)