dnl Autoconfigure input file for fetchmail
dnl Eric S. Raymond <esr@thyrsus.com>
dnl
dnl Process this file with autoconf to produce a configure script.
dnl

AC_INIT(fetchmail.h)		dnl A distinctive file to look for in srcdir. 
AM_CONFIG_HEADER(config.h)

dnl We want these before the checks, so the checks can modify their values.
test -z "$CFLAGS" && CFLAGS="-O" AC_SUBST(CFLAGS)
test -z "$LDFLAGS" && LDFLAGS=AC_SUBST(LDFLAGS)

PACKAGE=`sed -n '/PACKAGE *= *\(.*\)/s//\1/p' <$srcdir/Makefile.in`
VERSION=`sed -n '/VERSION *= *\(.*\)/s//\1/p' <$srcdir/Makefile.in`
AM_INIT_AUTOMAKE("$PACKAGE", "$VERSION")

AC_CANONICAL_HOST
AC_PROG_CC
AC_PROG_INSTALL
AC_PROG_CPP			dnl Later checks need this.
AC_PROG_CC_C_O
AC_AIX
AC_ISC_POSIX
AC_MINIX
AC_HEADER_STDC
AC_TYPE_SIZE_T
AC_TYPE_PID_T
AC_TYPE_SIGNAL
AC_CHECK_HEADERS(unistd.h termios.h termio.h sgtty.h stdarg.h alloca.h)
AC_CHECK_HEADERS(sys/itimer.h fcntl.h sys/fcntl.h memory.h sys/wait.h sys/shm.h)
AC_CHECK_HEADERS(arpa/inet.h arpa/nameser.h resolv.h net/socket.h sys/select.h)

AC_C_CONST			dnl getopt needs this.

dnl do NOT use AM_PROG_LEX, builds without LEX are not supported properly
AC_PROG_LEX
AC_PROG_MAKE_SET
AC_PROG_YACC
AC_SUBST(CPFLAGS)
AC_SUBST(CEFLAGS)
AC_SUBST(LDEFLAGS)
AC_SUBST(LIBOBJS)

# Check for LynxOS special case: -lbsd needed (at least on 2.3.0) and -s
# not working.
if test `uname` = "LynxOS" 
then
  echo "Adding -lbsd to standard libraries"
  LIBS="$LIBS -lbsd"
  LDFLAGS=""
  echo "Prepending standard include path to gcc flags"
  CPFLAGS="-I/usr/include"
fi

# Check for FreeBSD special case: more libs needed
if test `uname` = "FreeBSD" 
then
   echo "Adding -lmd -lkvm -lcom_err to standard libraries"
   LIBS="$LIBS -lmd -lkvm -lcom_err"
fi
 
# Check for Rhapsody special case: it doesn't like -s
if test `uname` = "Rhapsody" 
then
   echo "Removing -s load flag"
   LDFLAGS=`echo $LDFLAGS | sed "s/-s //"`
fi
 
dnl i18n
ALL_LINGUAS="cs da de es fr gl ja pl pt_BR tr"
AM_GNU_GETTEXT
dnl end i18n

# Under sysV68, socket and friends are provided by the C library.
# -linet does not provide socket, but causes multiple definition
# errors at link-time.  It is thus better to only use the C library.
# So don't add -linet to the link list unless it's necessary
AC_CHECK_FUNC(socket,
    AC_MSG_RESULT(using libc's socket),
    AC_CHECK_LIB(socket,socket)
    AC_CHECK_LIB(inet,socket))

# The condition in this test copes with the presence of inet_addr in libc6.
AC_CHECK_FUNC(inet_addr,
    AC_MSG_RESULT(using libc's inet_addr),
    AC_CHECK_LIB(nsl,inet_addr))

dnl Port hack for Interactive UNIX System V/386 Release 3.2
AC_CHECK_LIB(cposix, strchr,
		[EXTRADEFS="$EXTRADEFS -D_SYSV3"
		LIBS="$LIBS -lcposix"])

dnl Port hack for Sparc/NetBSD-1.5
dnl (hmh) DON'T DO THAT! If sparc needs something like this,
dnl it means its gettext will NOT work if we switch to new
dnl GNU gettext, such as plural handling. Force it to use
dnl --with-included-gettext, and upgrade gettext in your
dnl system, I think the new one's configure will catch that.
dnl AC_CHECK_LIB(intl, gettext,
dnl		[LIBS="$LIBS -lintl"])

AC_CHECK_FUNC(strstr, AC_DEFINE(HAVE_STRSTR), 
              [EXTRASRC="$EXTRASRC \$(srcdir)/strstr.c"
               EXTRAOBJ="$EXTRAOBJ strstr.o"])

AC_CHECK_FUNC(strcasecmp, AC_DEFINE(HAVE_STRCASECMP), 
              [EXTRASRC="$EXTRASRC \$(srcdir)/strcasecmp.c"
               EXTRAOBJ="$EXTRAOBJ strcasecmp.o"])
             
AC_CHECK_FUNC(memmove, AC_DEFINE(HAVE_MEMMOVE), 
              [EXTRASRC="$EXTRASRC \$(srcdir)/memmove.c"
               EXTRAOBJ="$EXTRAOBJ memmove.o"])
             
AC_CHECK_FUNC(MD5Init, AC_DEFINE(HAVE_MD5),
              [EXTRASRC="$EXTRASRC \$(srcdir)/md5c.c"
               EXTRAOBJ="$EXTRAOBJ md5c.o"])

AC_CHECK_FUNC(getopt_long, AC_DEFINE(HAVE_GETOPT_LONG),
              [EXTRASRC="$EXTRASRC \$(srcdir)/getopt.c \$(srcdir)/getopt1.c"
               EXTRAOBJ="$EXTRAOBJ getopt.o getopt1.o"])

AC_FUNC_VPRINTF
AC_FUNC_ALLOCA
if test -n "$ALLOCA" 
then
  EXTRASRC="$EXTRASRC \$(srcdir)/alloca.c"
  EXTRAOBJ="$EXTRAOBJ alloca.o"
fi

dnl AC_CHECK_FUNC calls that might hack the Makefile must precede
dnl the following AC_SUBSTs

AC_SUBST(EXTRADEFS)
AC_SUBST(EXTRASRC)
AC_SUBST(EXTRAOBJ)

AC_CHECK_FUNCS(tcsetattr stty setsid geteuid seteuid gethostbyname \
  res_search herror strrchr strerror setlinebuf syslog \
  snprintf vprintf vsnprintf vsyslog \
  atexit inet_aton strftime setrlimit socketpair sigprocmask sigaction \
  getopt_long)

# Under Red Hat 4.0 (and many other Linuxes) -lresolv is seriously flaky
# and breaks gethostbyname(2).  It's better to use the bind stuff in the C
# library.  So don't add -lresolv to the link list unless it's necessary
# (It will be necessary when using GNU libc6).
AC_CHECK_FUNC(res_search,
    AC_MSG_RESULT(using libc's resolver functions),
    AC_CHECK_LIB(resolv,res_search, 
	[AC_DEFINE(HAVE_RES_SEARCH) AC_MSG_RESULT(found resolver functions in libresolv); LIBS="$LIBS -lresolv"], AC_MSG_RESULT(no resolver calls found)))

dnl Check for libcrypt -- it may live in libc or libcrypt, as on IRIX
AC_CHECK_FUNC(crypt, , AC_CHECK_LIB(crypt,crypt))

dnl Check for RSA refersence library in case we're using SSL
AC_CHECK_LIB(rsaref, RSAPublicDecrypt)

dnl AC_FUNC_SETVBUF_REVERSED

dnl Check for usable void pointer type
AC_MSG_CHECKING(use of void pointer type)
AC_TRY_COMPILE([],
   [char *p;
    void *xmalloc();
    p = (char *) xmalloc(1);
   ],
 [AC_DEFINE(HAVE_VOIDPOINTER) AC_MSG_RESULT(yes)],
 AC_MSG_RESULT(no))

dnl Check for ANSI volatile
AC_MSG_CHECKING(for ANSI volatile)
AC_TRY_COMPILE([],
   [volatile int n;],
 [AC_DEFINE(HAVE_VOLATILE) AC_MSG_RESULT(yes)],
 AC_MSG_RESULT(no))

dnl Check out the wait reality.  We have to assume sys/wait.h is present.
AC_CHECK_FUNCS(waitpid wait3)
AC_MSG_CHECKING(for union wait);
AC_TRY_LINK([#include <sys/types.h>
#include <sys/wait.h>],
	 	 [union wait status; int pid; pid = wait (&status);
#ifdef WEXITSTATUS
/* Some POSIXoid systems have both the new-style macros and the old
   union wait type, and they do not work together.  If union wait
   conflicts with WEXITSTATUS et al, we don't want to use it at all.  */
if (WEXITSTATUS (status) != 0) pid = -1;
#endif
#ifdef HAVE_WAITPID
/* Make sure union wait works with waitpid.  */
pid = waitpid (-1, &status, 0);
#endif
],
  [AC_DEFINE(HAVE_UNION_WAIT) AC_MSG_RESULT(yes)],
  AC_MSG_RESULT(no))

AC_MSG_CHECKING(sys_siglist declaration in signal.h or unistd.h)
AC_TRY_LINK([#include <signal.h>
/* NetBSD declares sys_siglist in <unistd.h>.  */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif], [char *msg = *(sys_siglist + 1);],
  [AC_DEFINE(SYS_SIGLIST_DECLARED) AC_MSG_RESULT(yes)],
  AC_MSG_RESULT(no))

# Find the right directory to put the root-mode PID file in
for dir in "/var/run" "/etc"
do
	if test -d $dir 
	then
		break;
	fi
done
AC_MSG_RESULT(root-mode pid file will go in $dir)
AC_DEFINE_UNQUOTED(PID_DIR, "$dir")

# We may have a fallback MDA available in case the socket open to the 
# local SMTP listener fails.  Best to use procmail for this, as we know
# it won't try delivering through local SMTP and cause a mail loop.
# Sendmail without the -t option to use the message headers will work too,
# not just for sendmail itself but for workalikes like exim.
#
# Note1: A disadvantage of using procmail is that local alias expansion
# according to /etc/aliases won't get done if we fall back.  This doesn't
# matter in single-drop mode.
#
# Note2: it would be a very bad idea to use any MDA that doesn't return
# a refuse-to-deliver status on disk- or process-table-full
# conditions; mail could get lost that way.  Both procmail and
# sendmail (and all of the MDAs like exim that might be lurking under
# a sendmail alias) do the right thing in this circumstance.
#
AC_PATH_PROG(procmail, procmail, "", $PATH:/usr/sbin)
AC_PATH_PROG(sendmail, sendmail, "", $PATH:/usr/sbin:/usr/lib)
AC_PATH_PROG(maildrop, maildrop, "", $PATH:/usr/local/bin)

###	use option --disable-fallback to disable fallback MDA
###	use option --enable-fallback=procmail or 
###		   --enable-fallback=sendmail to select
AC_ARG_ENABLE(fallback,
	[  --enable-fallback=procmail    enable procmail as fallback (default)
  --enable-fallback=sendmail    enable /usr/sbin/sendmail as fallback
  --enable-fallback=maildrop    enable maildrop as fallback
  --enable-fallback=no          disable fallback],,[enable_fallback=auto])

case "$enable_fallback" in
	sendmail)	if test -z "$sendmail" ; then
				AC_ERROR([Sendmail selected as fallback, but not found])
				#not reached
			fi
			AC_DEFINE_UNQUOTED(FALLBACK_MDA, "$sendmail %T")
			echo "Will use $sendmail as fallback MDA."
			;;
	procmail)	if test -z "$procmail" ; then
				AC_ERROR([procmail selected as fallback, but not found])
				#not reached
			fi
			AC_DEFINE_UNQUOTED(FALLBACK_MDA, "$procmail -d %T")
			echo "Will use $procmail as fallback MDA."
			;;
	maildrop)	if test -z "$maildrop" ; then
				AC_ERROR([maildrop selected as fallback, but not found])
				#not reached
			fi
			AC_DEFINE_UNQUOTED(FALLBACK_MDA, "$maildrop -d %T")
			echo "Will use $maildrop as fallback MDA."
			;;
	no|unset)	echo "Will not use a fallback MDA"
			;;
	auto|yes|set)	if test -n "$procmail" ; then
				AC_DEFINE_UNQUOTED(FALLBACK_MDA,"$procmail -d %T")
				echo "Will use $procmail as fallback MDA."
			elif test -n "$sendmail" ; then
				AC_DEFINE_UNQUOTED(FALLBACK_MDA,"$sendmail %T")
				echo "Will use $sendmail as fallback MDA."
			else	echo "No fallback MDA available."
			fi
			;;
	*)		AC_ERROR([unkown value for --enable-fallback given: $enable_fallback])
			#notreached
			;;
esac

AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)

###	use option --enable-POP2 to compile in the POP2 support
AC_ARG_ENABLE(POP2,
	[  --enable-POP2           compile in POP2 protocol support (obsolete)],
	[with_POP2=$enableval],
	[with_POP2=no])
test "$with_POP2" = "yes" && AC_DEFINE(POP2_ENABLE)

###	use option --disable-POP3 to omit the POP3 support
AC_ARG_ENABLE(POP3,
	[  --disable-POP3          don't compile in POP3 protocol support],
	[with_POP3=$enableval],
	[with_POP3=yes])
test "$with_POP3" = "yes" && AC_DEFINE(POP3_ENABLE)

###	use option --disable-IMAP to omit the IMAP support
AC_ARG_ENABLE(IMAP,
	[  --disable-IMAP          don't compile in IMAP protocol support],
	[with_IMAP=$enableval],
	[with_IMAP=yes])
test "$with_IMAP" = "yes" && AC_DEFINE(IMAP_ENABLE)

###	use option --disable-ETRN to omit the ETRN support
AC_ARG_ENABLE(ETRN,
	[  --disable-ETRN          don't compile in ETRN protocol support],
	[with_ETRN=$enableval],
	[with_ETRN=yes])
test "$with_ETRN" = "yes" && AC_DEFINE(ETRN_ENABLE)

###	use option --disable-ODMR to omit the ODMR support
AC_ARG_ENABLE(ODMR,
	[  --disable-ODMR          don't compile in ODMR protocol support],
	[with_ODMR=$enableval],
	[with_ODMR=yes])
test "$with_ODMR" = "yes" && AC_DEFINE(ODMR_ENABLE)

###	use option --enable-RPA to compile in the RPA support
AC_ARG_ENABLE(RPA,
	[  --enable-RPA            compile in RPA protocol support],
	[with_RPA=$enableval],
	[with_RPA=no])
test "$with_RPA" = "yes" && AC_DEFINE(RPA_ENABLE)

###	use option --enable-NTLM to compile in the NTLM support
AC_ARG_ENABLE(NTLM,
	[  --enable-NTLM           compile in NTLM authentication support],
	[with_NTLM=$enableval],
	[with_NTLM=no])
test "$with_NTLM" = "yes" && AC_DEFINE(NTLM_ENABLE)

###	use option --enable-SDPS to compile in the SDPS support
AC_ARG_ENABLE(SDPS,
	[  --enable-SDPS           compile in SDPS protocol support],
	[with_SDPS=$enableval],
	[with_SDPS=no])
test "$with_SDPS" = "yes" && AC_DEFINE(SDPS_ENABLE)

###	use option --enable-opie to compile in the OPIE support
AC_ARG_ENABLE(opie,
	[  --enable-opie           support OTP through the OPIE library],
	[ AC_CHECK_HEADER(opie.h,, [echo 'configure: cannot find <opie.h>, which is required for OPIE support.'; exit 1])
          AC_CHECK_LIB(opie,opiegenerator,, [echo 'configure: cannot find libopie, which is required for OPIE support.'; exit 1])
          with_opie=$enableval],
	[with_opie=no])
test "$with_opie" = "yes" && AC_DEFINE(OPIE_ENABLE)

AC_ARG_ENABLE(inet6,
	[  --enable-inet6          support IPv6 (requires the inet6-apps library)],

	[ AC_CHECK_FUNC(getaddrinfo, [with_inet6=yes],
	  [ LDFLAGS="$LDFLAGS -L/usr/inet6/lib";
	    AC_CHECK_LIB(inet6, getaddrinfo, [with_inet6=yes
	    LIBS="$LIBS -linet6"],
	    [ echo 'configure: cannot find proper glibc version or libinet6,';
	      echo '           which is required for IPv6 support.';
	      exit 1]) ] )],
	[with_inet6=no])
test "$with_inet6" = "yes" && AC_DEFINE(INET6_ENABLE)

AC_CHECK_FUNCS(inner_connect)

AC_ARG_ENABLE(netsec,
	[  --enable-netsec         support network security (requires inet6-apps library)],
        [ unset ac_cv_lib_inet6_net_security_strtorequest; AC_CHECK_LIB(inet6, net_security_strtorequest,,
	  [ unset ac_cv_lib_inet6_net_security_strtorequest;
            LDFLAGS="$LDFLAGS -L/usr/inet6/lib"; 
            AC_CHECK_LIB(inet6, net_security_strtorequest,,
            [ echo 'configure: cannot find net_security_strtorequest in libinet6, which is required';
              echo '           for network security support. Either it does not exist, or it was';
              echo '           not built with network security support enabled.';
              exit 1]) ])
        unset ac_cv_header_net_security_h; AC_CHECK_HEADER(net/security.h,,
        [ unset ac_cv_header_net_security_h; 
	CPPFLAGS="$CPPFLAGS -I/usr/inet6/include"; 
	CFLAGS="$CFLAGS -I/usr/inet6/include"; AC_CHECK_HEADER(net/security.h,,
	  [ echo 'configure: cannot find <net/security.h>, which is required';
          echo '             for network security support.';
          exit 1]) ]) ]
	[with_netsec=no])
test "$with_netsec" = "yes" && AC_DEFINE(NET_SECURITY)

###	use option --with-ssl to compile in the SSL support
AC_ARG_WITH(ssl,
	[  --with-ssl=[DIR]        enable SSL support using libraries in DIR],
	[with_ssl=$withval],
	[with_ssl=no])
test "$with_ssl" != "no" && AC_DEFINE(SSL_ENABLE)

if test "$with_ssl" = "yes"
then
    #	He didn't specify an SSL location.  Let's look at some common
    #	directories where SSL has been found in the past and try and auto
    #	configure for SSL.  OpenSSL determination will be made later.
    #	This will screw up if an OpenSSL install is located in a later
    #	directory than an older SSLeay install, but the user should fix that
    #	anyways and he can override on the configure line.
    for ac_dir in \
      /usr/local/ssl \
      /usr/ssl \
      /local/ssl \
      /opt/ssl \
      ; \
    do
        if test -d "$ac_dir" ; then
            with_ssl=$ac_dir
            break;
        fi
    done
fi

if test -n "$with_ssl" -a "$with_ssl" != "no"
then
  # With the autoconfigure above, the only time this is going to be
  # true is going to be when we could not find the headers.  If they
  # are not in system standard locations, we are going to be broken.
  if test "$with_ssl" = "yes"
  then
    # Let's just define the standard location for the SSLeay root
    with_ssl="/usr/local/ssl"
  fi
  if test -r $with_ssl/include/openssl/ssl.h
  then
    ###	ssl.h found under openssl.  Use openssl configuration preferentially
    echo "Enabling OpenSSL support in $with_ssl"
    CEFLAGS="$CEFLAGS -I$with_ssl/include -I$with_ssl/include/openssl"
    ###	OpenBSD comes with ssl headers
  elif test -r /usr/include/ssl/ssl.h
  then
    echo "Enabling SSLeay support in $with_ssl"
    CEFLAGS="$CEFLAGS -I/usr/include/ssl"
  else
    echo "Enabling SSLeay support in $with_ssl"
    CEFLAGS="$CEFLAGS -I$with_ssl/include"
  fi
  LDEFLAGS="$LDEFLAGS -L$with_ssl/lib"
  LIBS="$LIBS -lssl -lcrypto"
  AC_DEFINE(SSL_ENABLE)
else
  echo 'Disabling SSL support...'
fi

# This version of the Kerberos 4 and 5 options addresses the follwing issues:
# 
# * Build correctly under Heimdal kerberos if it is compiled with db2 and
#   OpenSSL support (Debian's is)
# * Build the kerberos.c stuff (KPOP) only for kerberosIV, to avoid breakage.
#   I don't know if this is 100% correct, but now at least IMAP and POP3
#   behave the same way regarding kerberosV.
# * Build without any fuss for both kerberosIV and V at the same time.
# * Move all the kerberos header mess to kerberos.h, and #include that
#   in driver.c and kerberos.c.
# 
# Tested using the Heimdal Kerberos V libs, Kungliga Tekniska Hgskolan (the
# Royal Institute of Technology in Stockholm, Sweden)'s kerberos IV libs, and
# the MIT reference implementation of KerberosV (all as packaged in Debian).

###	use option --with-kerberos5=DIR to point at a Kerberos 5 directory
### make sure --with-ssl is run before --with-kerberos* !
AC_ARG_WITH(kerberos5,
	[  --with-kerberos5=DIR    point fetchmail compilation at a Kerberos 5 directory],
[
if test "$with_kerberos5" != "no"
then
# Check for a OpenBSD special case
if test "$with_kerberos5" = "yes" && ( test `uname` = "OpenBSD" )
then
  AC_CHECKING([kerberosV for OpenBSD])
  AC_DEFINE(HEIMDAL)
  AC_DEFINE(KERBEROS_V5)
  CEFLAGS="$CEFLAGS -I/usr/include/kerberosV"
  LIBS="$LIBS -lasn1 -lkrb5 -lcom_err"
else
  if test "$with_kerberos5" != "yes" 
  then
      LDEFLAGS="$LDEFLAGS -L${with_kerberos5}/lib"
      searchdirs="$with_kerberos5"
  else
      searchdirs="/usr/kerberos /usr/local/krb5 /usr/athena /usr"
  fi
  with_kerberos5=
  for dir in $searchdirs
  do AC_MSG_CHECKING([for Kerberos V in $dir])
     if test -f "$dir/include/krb5.h"
     then
        ac_krblibs=
        if test -f "$dir/include/roken.h"
        then
           ac_krblibs="-lasn1 -lroken -lcom_err"
           AC_MSG_RESULT([Heimdal found])
	   dnl Attempt to detect if we need to -ldb2 to link Heimdal
	   dnl we assume we do if it is available
           AC_CHECK_LIB(db2, db_open, ac_krblibs="$ac_krblibs -ldb2", [],
		 ${LDEFLAGS})
           AC_CHECK_LIB(des, des_string_to_key, libk5crypto=-ldes,
              AC_CHECK_LIB(ssl, MD5_Init, [],
	         AC_ERROR([DES libraries not found. Try adding --with-ssl to enable OpenSSL support]),
	         ${LDEFLAGS} ${ac_krblibs}),
           ${LDEFLAGS} ${ac_krblibs})
           AC_DEFINE(HEIMDAL)
        else
	   AC_MSG_RESULT([found])
	   ac_krblibs="-lcom_err"
           AC_CHECK_LIB(crypto,
	      krb5_des_string_to_key,
	      libk5crypto=-lcrypto,
	         AC_CHECK_LIB(k5crypto,
	            krb5_des_string_to_key,
	            libk5crypto=-lk5crypto,
		       AC_ERROR([Kerberos 5 DES libraries not found]),
		    ${LDEFLAGS} ${ac_krblibs}),
                 ${LDEFLAGS} ${ac_krblibs})
        fi
        AC_CHECK_LIB(krb5, krb5_init_context,[],
           continue,
           ${LDEFLAGS} ${ac_krblibs})
        AC_DEFINE(KERBEROS_V5)
        test "$dir" != "/usr" && CEFLAGS="$CEFLAGS -I$dir/include"
        LDEFLAGS="$LDEFLAGS -L$dir/lib"
	LIBS="$LIBS $ac_krblibs $libk5crypto"
        with_kerberos5=$dir
        break
     else
        AC_MSG_RESULT([not found])
     fi
  done
  if test -z "$with_kerberos5" ; then 
     AC_ERROR([Kerberos 5 libraries not found])
  fi
fi
fi
]) dnl --with-kerberos5=DIR

###    use option --with-kerberos=DIR to point at a Kerberos 4 directory
AC_ARG_WITH(kerberos,
	[  --with-kerberos=DIR     point fetchmail compilation at a Kerberos 4 directory],
[
if test "$with_kerberos" != "no"
then
# Check for a NetBSD/OpenBSD special case
if test "$with_kerberos" = "yes" && ( test `uname` = "NetBSD" || test `uname` = "OpenBSD" )
then
  AC_CHECKING([kerberosIV for `uname`])
  AC_DEFINE(KERBEROS_V4)
  CEFLAGS="$CEFLAGS -I/usr/include/kerberosIV"
  LIBS="$LIBS -lkrb -ldes"
else
  #we need to detect when we're building under a kerberosV compatibility
  #layer, btw...
  if test "$with_kerberos" != "yes" ; then
     searchdirs="$with_kerberos"
  else
     searchdirs="$with_kerberos5 /usr/kerberos /usr/kerberosIV /usr/athena /usr"
  fi
  with_kerberos=
  ac_saveLDFLAGS="$LDFLAGS"
  for dir in $searchdirs
  do
     AC_MSG_CHECKING([for Kerberos IV in $dir])
     if test -f "$dir/include/krb.h" || test -f "$dir/include/krb4.h" \
     	     || test -f "$dir/include/kerberosIV/krb.h"
     then
        AC_MSG_RESULT([found])
     else
        AC_MSG_RESULT([not found])
	continue
     fi
     #Find libs
     if test -f "$with_kerberos5/roken.h" ; then
       AC_CHECK_LIB(45, krb_mk_req)
     fi
     LDFLAGS="-L$dir/lib $ac_saveLDFLAGS"
     AC_SEARCH_LIBS(des_string_to_key, [des425 des crypto], [], continue)
     AC_SEARCH_LIBS(krb_realmofhost, [krb4 krb], [], continue)
     with_kerberos="$dir"
     if test -f "$dir/include/kerberosIV/krb.h" ; then
        dir="$dir/include/kerberosIV"
     else
	dir="$dir/include"
     fi
     AC_DEFINE(KERBEROS_V4)
     test -f "$with_kerberos5/roken.h" && AC_DEFINE(HEIMDAL)
     test "$dir" != "/usr/include" && CEFLAGS="$CEFLAGS -I$dir"
     LDEFLAGS="$LDEFLAGS -L$with_kerberos/lib"
     break
  done
  if test -z "$with_kerberos" ; then
     AC_ERROR([Kerberos 4 libraries not found])
  fi
  LDFLAGS="$ac_saveLDFLAGS"
fi
fi
]) dnl --with-kerberos=DIR

###	use option --with-socks=DIR to point at SOCKS library
AC_ARG_WITH(socks,
	[  --with-socks[=DIR]      add built-in SOCKS firewall access],
[
if test "$with_socks" != no
then
    if test "$with_socks" != yes
    then
        LDEFLAGS="$LDEFLAGS -L$with_socks"
    else
        AC_CHECK_LIB(socks, Rconnect,,
               AC_MSG_ERROR([could not find libsocks which is needed for built-in SOCKS support]))
    fi
    AC_DEFINE(HAVE_SOCKS)
    CEFLAGS="$CEFLAGS -Dconnect=Rconnect -Dgetsockname=Rgetsockname -Dbind=Rbind -Daccept=Raccept -Dlisten=Rlisten -Dselect=Rselect"
    LIBS="-lsocks $LIBS"
fi])

###     use option --with-socks5=DIR to point at SOCKS library
AC_ARG_WITH(socks5,
        [  --with-socks5[=DIR]     add built-in SOCKS5 firewall access],
[
if test "$with_socks5" != no
then
  if test "$with_socks5" != yes
  then
    LDEFLAGS="$LDEFLAGS -L$with_socks5"
  fi
  ac_savedLDFLAGS="$LDFLAGS"
  LDFLAGS="$LDEFLAGS $LDFLAGS"
  AC_CHECK_LIB(socks5, SOCKSconnect,,
  	AC_MSG_ERROR([could not find libsocks5 which is needed for built-in SOCKS5 support]))
  AC_DEFINE(HAVE_SOCKS)
  CEFLAGS="$CEFLAGS -Dconnect=SOCKSconnect -Dgetsockname=SOCKSgetsockname -Dbind=SOCKSbind -Daccept=SOCKSaccept -Dlisten=SOCKSlisten -Dselect=SOCKSselect -Drecvfrom=SOCKSrecvfrom -Dsendto=SOCKSsendto -Drecv=SOCKSrecv -Dsend=SOCKSsend -Dread=SOCKSread -Dwrite=SOCKSwrite -Drresvport=SOCKSrresvport -Dshutdown=SOCKSshutdown -Dlisten=SOCKSlisten -Dclose=SOCKSclose -Ddup=SOCKSdup -Ddup2=SOCKSdup2 -Dgethostbyname=SOCKSgethostbyname"
  AC_CHECK_FUNC(SOCKSfclose, [CFLAGS="$CFLAGS -Dfclose=SOCKSfclose"])
  LDFLAGS="$ac_savedLDFLAGS"
fi])

###	use option --with-hesiod=DIR to point at a HESIOD directory
AC_ARG_WITH(hesiod,
	[  --with-hesiod=DIR       point fetchmail compilation at a HESIOD directory])

case "x$with_hesiod" in
xno)
    ;;
x)
    for dir in /usr/athena /usr /usr/local
    do
      if test -f "$dir/include/hesiod.h"
      then
        CEFLAGS="$CEFLAGS -DHESIOD -I$dir/include"
        LDEFLAGS="$LDEFLAGS -L$dir/lib"
        LIBS="$LIBS -lhesiod"
        with_hesiod=$dir
        break
      fi
    done
    ;;
*)
    # Path given
    CEFLAGS="$CEFLAGS -DHESIOD -I$with_hesiod/include"
    LDEFLAGS="$LDEFLAGS -L$with_hesiod/lib"
    LIBS="$LIBS -lhesiod"
    ;;
esac

###	use option --with-gssapi=DIR to compile in GSSAPI support
AC_ARG_WITH(gssapi,
	[  --with-gssapi[=DIR]     compile in GSSAPI support using libraries in DIR],
[
if test "$with_gssapi" != "no"
then
  if test "$with_gssapi" = "yes" -a -n "$with_kerberos5"
  then
    with_gssapi=$with_kerberos5
  fi
  if test "$with_gssapi" != "yes" -a -n "$with_gssapi"
  then
    CFLAGS="$CFLAGS -I$with_gssapi/include"
    LDFLAGS="$LDFLAGS -L$with_gssapi/lib"
  fi

  if test -f "$with_gssapi/include/roken.h"
  then
     LIBS="$LIBS -lkrb5 -lasn1 -ldes -lroken -ldb -ldl"
     AC_CHECK_LIB(gssapi, gss_init_sec_context,LIBS="$LIBS -lgssapi",
                  AC_MSG_ERROR([could not find libgssapi which is needed for GSSAPI support]), )
     AC_DEFINE(HEIMDAL)
  else
     AC_CHECK_LIB(gssapi_krb5, gss_init_sec_context,LIBS="$LIBS -lgssapi_krb5",
                  AC_MSG_ERROR([could not find libgssapi_krb5 which is needed for GSSAPI support]), -lkrb5)
  fi
  AC_DEFINE(GSSAPI)
  save_CPPFLAGS=$CPPFLAGS
  CPPFLAGS="-I$with_gssapi/include"
  AC_CHECK_HEADERS(gssapi.h gssapi/gssapi.h gssapi/gssapi_generic.h)
  if test "$ac_cv_header_gssapi_h" = "yes"; then
    AC_EGREP_HEADER(GSS_C_NT_HOSTBASED_SERVICE, gssapi.h, AC_DEFINE(HAVE_GSS_C_NT_HOSTBASED_SERVICE))
  else
    AC_EGREP_HEADER(GSS_C_NT_HOSTBASED_SERVICE, gssapi/gssapi.h, AC_DEFINE(HAVE_GSS_C_NT_HOSTBASED_SERVICE))
  fi
fi])

AC_OUTPUT([Makefile intl/Makefile po/Makefile.in], [
	# The reason for this odd makedepend line is that we want
	# to have all dependencies evaluated relative to the source directory
	# and let VPATH do all the dirty work when we build remotely
	echo "You can ignore any makedepend error messages:";
	echo timestamp > stamp-h;
	(cd $srcdir; makedepend -f - *.c) >>Makefile])

dnl Local Variables:
dnl comment-start: "dnl "
dnl comment-end: ""
dnl comment-start-skip: "\\bdnl\\b\\s *"
dnl compile-command: "make configure config.h.in"
dnl End: