xAC_PREREQ([2.59])
AC_INIT([dovecot],[1.0.rc15],[dovecot@dovecot.org])
AC_CONFIG_SRCDIR([src])

AM_INIT_AUTOMAKE

AM_MAINTAINER_MODE

AC_ISC_POSIX
AC_PROG_CC
AC_PROG_CPP
AC_HEADER_STDC
AC_C_INLINE
AC_PROG_LIBTOOL
AM_ICONV

AC_CHECK_HEADERS(strings.h stdint.h unistd.h dirent.h \
  sys/uio.h sys/sysmacros.h sys/resource.h sys/select.h libgen.h \
  sys/quota.h sys/fs/ufs_quota.h ufs/ufs/quota.h jfs/quota.h \
  mntent.h sys/mnttab.h sys/event.h sys/time.h sys/mkdev.h linux/dqblk_xfs.h \
  xfs/xqm.h sasl.h sasl/sasl.h)

AC_ARG_ENABLE(ipv6,
[  --enable-ipv6           Enable IPv6 support (default)],
	if test x$enableval = xno; then
		want_ipv6=no
	else
		want_ipv6=yes
	fi,
	want_ipv6=yes)

AC_ARG_ENABLE(debug,
[  --enable-debug          Enable some extra expensive checks for developers],
	if test x$enableval = xyes; then
		AC_DEFINE(DEBUG,, Build with extra debugging checks)
	fi)

AC_ARG_ENABLE(asserts,
[  --enable-asserts        Enable asserts (default)],
	if test x$enableval = xno; then
		AC_DEFINE(DISABLE_ASSERTS,, Disable asserts)
	fi)

AC_ARG_WITH(file-offset-size,
[  --with-file-offset-size=BITS  Set size of file offsets. Usually 32 or 64.
                          (default: 64 if available)],
	preferred_off_t_bits=$withval,
	preferred_off_t_bits=64)

AC_ARG_WITH(mem-align,
[  --with-mem-align=BYTES  Set the memory alignment (default: 8)],
	mem_align=$withval,
	mem_align=8)

AC_ARG_WITH(ioloop,
[  --with-ioloop=IOLOOP    Specify the I/O loop method to use
                          (epoll, kqueue, poll; best for the fastest available;
			   default is poll)],
	ioloop=$withval,
	ioloop=poll)

AC_ARG_WITH(notify,
[  --with-notify=NOTIFY    Specify the file system notification method to use
                          (inotify, kqueue, dnotify, none;
                           default is detected in the above order)],
	notify=$withval,
	notify=)

AC_ARG_WITH(linux-quota,
[  --with-linux-quota=n    Linux quota version to use (default: system's)],
	AC_DEFINE_UNQUOTED(_LINUX_QUOTA_VERSION, $withval,
		[Linux quota version to use])
)

AC_ARG_WITH(passwd,
[  --with-passwd           Build with /etc/passwd support (default)],
	if test x$withval = xno; then
		want_passwd=no
	else
		want_passwd=yes
	fi,
	want_passwd=yes)

AC_ARG_WITH(passwd-file,
[  --with-passwd-file      Build with passwd-like file support (default)],
	if test x$withval = xno; then
		want_passwd_file=no
	else
		want_passwd_file=yes
	fi,
	want_passwd_file=yes)

AC_ARG_WITH(shadow,
[  --with-shadow           Build with shadow password support (default)],
	if test x$withval = xno; then
		want_shadow=no
	else
		want_shadow=yes
	fi,
	want_shadow=yes)

AC_ARG_WITH(pam,
[  --with-pam              Build with PAM support (default)],
	if test x$withval = xno; then
		want_pam=no
	else
		want_pam=yes
	fi,
	want_pam=yes)

AC_ARG_WITH(checkpassword,
[  --with-checkpassword    Build with checkpassword support (default)],
	if test x$withval = xno; then
		want_checkpassword=no
	else
		want_checkpassword=yes
	fi,
	want_checkpassword=yes)

AC_ARG_WITH(bsdauth,
[  --with-bsdauth          Build with BSD authentication support (default)],
	if test x$withval = xno; then
		want_bsdauth=no
	else
		want_bsdauth=yes
	fi,
	want_bsdauth=yes)

AC_ARG_WITH(gssapi,
[  --with-gssapi           Build with GSSAPI authentication support],
    if test x$withval = xno; then
		want_gssapi=no
	else
		want_gssapi=yes
	fi,
	want_gssapi=no)

AC_ARG_WITH(sia,
[  --with-sia              Build with Tru64 SIA support],
      if test x$withval = xno; then
              want_sia=no
      else
              want_sia=yes
      fi,
      want_sia=no)

AC_ARG_WITH(ldap,
[  --with-ldap             Build with LDAP support],
	if test x$withval = xno; then
		want_ldap=no
	else
		want_ldap=yes
	fi,
	want_ldap=no)

AC_ARG_WITH(vpopmail,
[  --with-vpopmail         Build with vpopmail support (default)],
	if test x$withval = xno; then
		want_vpopmail=no
	else
		want_vpopmail=yes
	fi,
	want_vpopmail=yes)

AC_ARG_WITH(static-userdb,
[  --with-static-userdb    Build with static userdb support (default)],
	if test x$withval = xno; then
		want_static_userdb=no
	else
		want_static_userdb=yes
	fi,
	want_static_userdb=yes)

AC_ARG_WITH(prefetch-userdb,
[  --with-prefetch-userdb  Build with prefetch userdb support (default)],
	if test x$withval = xno; then
		want_prefetch_userdb=no
	else
		want_prefetch_userdb=yes
	fi,
	want_prefetch_userdb=yes)

dnl The --with-sql is useful only if Dovecot is being built with all the SQL
dnl drivers as modules. If any SQL driver is built-in, this option is ignored.
AC_ARG_WITH(sql,
[  --with-sql              Build with generic SQL support],
	if test x$withval = xno; then
		want_sql=no
	else
		want_sql=yes
	fi,
	want_sql=no)

AC_ARG_WITH(pgsql,
[  --with-pgsql            Build with PostgreSQL driver support],
	if test x$withval = xno; then
		want_pgsql=no
	else
		want_pgsql=yes
	fi,
	want_pgsql=no)

AC_ARG_WITH(mysql,
[  --with-mysql            Build with MySQL driver support],
	if test x$withval = xno; then
		want_mysql=no
	else
		want_mysql=yes
	fi,
	want_mysql=no)

AC_ARG_WITH(sqlite,
[  --with-sqlite           Build with SQLite3 driver support],
	if test x$withval = xno; then
		want_sqlite=no
	else
	want_sqlite=yes
	fi,
	want_sqlite=no)

AC_ARG_WITH(ssl,
[  --with-ssl=[gnutls|openssl] Build with GNUTLS or OpenSSL (default)],
	if test x$withval = xno; then
		want_gnutls=no
		want_openssl=no
	elif test x$withval = xgnutls; then
		want_gnutls=yes
		want_openssl=no
	elif test x$withval = xopenssl; then
		want_gnutls=no
		want_openssl=yes
	else
		want_gnutls=no
		want_openssl=yes
	fi, [
		want_gnutls=no
		want_openssl=yes
	])

AC_ARG_WITH(ssldir,
[  --with-ssldir=DIR       SSL base directory for certificates (/etc/ssl)],
	ssldir="$withval",
	ssldir=/etc/ssl
)
AC_SUBST(ssldir)

AC_ARG_WITH(rundir,
[  --with-rundir=DIR       Runtime data directory (LOCALSTATEDIR/run/dovecot)],
	rundir="$withval",
	rundir=$localstatedir/run/$PACKAGE_NAME
)
AC_SUBST(rundir)

AC_ARG_WITH(statedir,
[  --with-statedir=DIR     Permanent data directory (LOCALSTATEDIR/lib/dovecot)],
	statedir="$withval",
	statedir=$localstatedir/lib/$PACKAGE_NAME
)
AC_SUBST(statedir)

AC_ARG_WITH(gc,
[  --with-gc               Use Boehm garbage collector],
	if test x$withval = xyes; then
		want_gc=yes
	else
		if test "x$withval" = xno; then
			want_gc=no
		else
			want_gc=yes
		fi
	fi,
	want_gc=no)

AC_ARG_WITH(pop3d,
[  --with-pop3d            Build POP3 server (default)],
	if test x$withval = xno; then
		want_pop3d=no
	else
		want_pop3d=yes
	fi,
	want_pop3d=yes)
AM_CONDITIONAL(BUILD_POP3D, test "$want_pop3d" = "yes")

AC_ARG_WITH(deliver,
[  --with-deliver          Build mail delivery agent (default)],
	if test x$withval = xno; then
		want_deliver=no
	else
		want_deliver=yes
	fi,
	want_deliver=yes)
AM_CONDITIONAL(BUILD_DELIVER, test "$want_deliver" = "yes")

AC_ARG_WITH(storages,
[  --with-storages         Build with specified mail storage formats (maildir,mbox)], [
	if test "$withval" = "yes" -o "$withval" = "no"; then
		AC_MSG_ERROR([--with-storages needs storage list as parameter])
	fi
	mail_storages=`echo "$withval"|sed 's/,/ /g'` ],
	mail_storages="maildir mbox dbox")
AC_SUBST(mail_storages)

AC_ARG_WITH(sql-drivers,
[  --with-sql-drivers      Build with specified SQL drivers (all)], [
	sql_drivers=`echo "$withval"|sed 's/,/ /g'` ],
	sql_drivers="all")

if test "$sql_drivers" = "all" -o "$sql_drivers" = "yes"; then
  all_sql_drivers=yes
  sql_drivers=
elif test "$sql_drivers" = "no"; then
  # --without-sql-drivers given
  sql_drivers=
fi

AC_ARG_WITH(moduledir,
[  --with-moduledir=DIR    Base directory for dynamically loadable modules],
	moduledir="$withval",
	moduledir=$libdir/dovecot
)
AC_SUBST(moduledir)

AC_ARG_WITH(docs,
[  --with-docs             Install documentation (default)],
	if test x$withval = xno; then
		want_docs=no
	else
		want_docs=yes
	fi,
	want_docs=yes)
AM_CONDITIONAL(BUILD_DOCS, test "$want_docs" = "yes")

dnl * gcc specific options
if test "x$ac_cv_c_compiler_gnu" = "xyes"; then
	# -Wcast-qual -Wcast-align -Wconversion # too many warnings
	# -Wstrict-prototypes -Wredundant-decls # may give warnings in some systems
	# -Wmissing-format-attribute -Wmissing-noreturn -Wwrite-strings # a couple of warnings
	# -Wstrict-aliasing=2 # requires new gcc
	CFLAGS="$CFLAGS -Wall -W -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wchar-subscripts -Wformat=2 -Wbad-function-cast"

	# Use std=gnu99 if we have new enough gcc
	old_cflags=$CFLAGS
	CFLAGS="-std=gnu99"
	AC_TRY_COMPILE([
	],, [
	  CFLAGS="$CFLAGS $old_cflags"
	], [
	  CFLAGS="$old_cflags"
	])
fi

dnl **
dnl ** just some generic stuff...
dnl **

AC_CHECK_FUNC(socket, [], [
	AC_CHECK_LIB(socket, socket, [
		LIBS="$LIBS -lsocket"
	])
])

AC_CHECK_FUNC(inet_addr, [], [
	AC_CHECK_LIB(nsl, inet_addr, [
		LIBS="$LIBS -lnsl"
	])
])

AC_CHECK_FUNC(fdatasync, [
	have_fdatasync=yes
], [
	AC_CHECK_LIB(rt, fdatasync, [
		have_fdatasync=yes
		LIBS="$LIBS -lrt"
	])
])

if test "$have_fdatasync" = "yes"; then
	AC_DEFINE(HAVE_FDATASYNC,, Define if you have fdatasync())
fi

dnl * after -lsocket and -lnsl tests, inet_aton() may be in them
AC_CHECK_FUNCS(fcntl flock lockf inet_aton sigaction getpagesize madvise \
               strcasecmp stricmp vsnprintf vsyslog writev pread \
	       setrlimit setproctitle seteuid setreuid setegid setresgid \
	       strtoull strtouq setpriority quotactl getmntent kqueue kevent \
           getrusage)

dnl * I/O loop function
have_ioloop=no

if test "$ioloop" = "best" || test "$ioloop" = "epoll"; then
  AC_TRY_RUN([
    #include <sys/epoll.h>

    int main()
    {
      return epoll_create(5) < 1;
    }
  ], [
    AC_DEFINE(IOLOOP_EPOLL,, Implement I/O loop with Linux 2.6 epoll())
    have_ioloop=yes
    ioloop=epoll
  ], [
    if test "$ioloop" = "epoll" ; then
      AC_MSG_ERROR([epoll ioloop requested but epoll_create() is not available])
    fi
  ])
fi

if test "$ioloop" = "best" || test "$ioloop" = "kqueue"; then
    if test "$ac_cv_func_kqueue" = yes && test "$ac_cv_func_kevent" = yes; then
      AC_DEFINE(IOLOOP_KQUEUE,, [Implement I/O loop with BSD kqueue()])
      ioloop=kqueue
      have_ioloop=yes
    elif test "$ioloop" = "kqueue"; then
      AC_MSG_ERROR([kqueue ioloop requested but kqueue() is not available])
    fi
fi

if test "$ioloop" = "best" || test "$ioloop" = "poll"; then
  AC_CHECK_FUNC(poll, [
    AC_DEFINE(IOLOOP_POLL,, Implement I/O loop with poll())
    ioloop=poll
    have_ioloop=yes
  ])
fi

if test "$have_ioloop" = "no"; then
  AC_DEFINE(IOLOOP_SELECT,, Implement I/O loop with select())
  ioloop="select"
fi

have_notify=none

if test "$notify" = "" || test "$notify" = "inotify" ; then
  AC_MSG_CHECKING([if we can use inotify])
  dnl * inotify?
  AC_TRY_RUN([
    #define _GNU_SOURCE
    #include <sys/ioctl.h>
    #include <fcntl.h>
    #include <sys/inotify.h>
    #include <stdio.h>
  
    int main()
    {
      int wd, fd;
      char * fn = "/tmp";
    
      fd = inotify_init ();
      if (fd < 0)
        {
          perror ("inotify_init");
          return (-1);
        }

      wd = inotify_add_watch (fd, fn, IN_ALL_EVENTS);

      if (wd < 0)
        {
          perror ("inotify_add_watch");
          return (-2);
        }

      inotify_rm_watch (fd, wd);

      close (fd);
    }
  ], [
    have_notify=inotify
    notify=inotify
    AC_DEFINE(IOLOOP_NOTIFY_INOTIFY,, Use Linux inotify)
    AC_MSG_RESULT("yes")
  ], [
    AC_MSG_RESULT("no")
    if test "$notify" = "inotify"; then
      AC_MSG_ERROR([inotify requested but not available])
      notify=""
    fi
  ])
fi

if (test "$notify" = "" && test "$ioloop" = kqueue) || test "$notify" = "kqueue"; then
  AC_MSG_CHECKING([if we can use BSD kqueue() notify])
  dnl * BSD kqueue() notify
  if test "$ac_cv_func_kqueue" = yes && test "$ac_cv_func_kevent" = yes ; then
    have_notify=kqueue
    notify=kqueue
    AC_MSG_RESULT("yes")
    AC_DEFINE(IOLOOP_NOTIFY_KQUEUE,,
      Use BSD kqueue directory changes notificaton)
  else 
    AC_MSG_RESULT("no")
    if test "$notfify" = "kqueue" ; then
      AC_MSG_ERROR([kqueue notify requested but kqueue() is not available])
      notify=""
    fi
  fi
fi

if test "$notify" = "" || test "$notify" = "dnotify"; then
  AC_MSG_CHECKING([if we can use dnotify])
  dnl * dnotify?
  AC_TRY_COMPILE([
    #define _GNU_SOURCE
    #include <fcntl.h>
    #include <signal.h>
    #include <unistd.h>
  ], [
    fcntl(0, F_SETSIG, SIGRTMIN);
    fcntl(0, F_NOTIFY, DN_CREATE | DN_DELETE | DN_RENAME | DN_MULTISHOT);
  ], [
    AC_MSG_RESULT("yes")
    AC_DEFINE(IOLOOP_NOTIFY_DNOTIFY,, Use Linux dnotify)
    have_notify=dnotify
    notify=dnotify
  ], [
    AC_MSG_RESULT("no")
    if test "$notify" = "dnotify"; then
      AC_MSG_ERROR([dnotify requested but not available])
    fi
  ])
fi

if test "$have_notify" = "none"; then
  AC_DEFINE(IOLOOP_NOTIFY_NONE,, No special notify support)
fi

dnl * GLIBC?
AC_TRY_COMPILE([
  #include <stdlib.h>
  #ifdef __GLIBC__
    we have glibc
  #endif
],,, [
  AC_DEFINE(PREAD_WRAPPERS,, Define if pread/pwrite needs _XOPEN_SOURCE 500)
])

dnl * OS specific options
case "$host_os" in
	hpux*)
		CFLAGS="$CFLAGS -D_XOPEN_SOURCE_EXTENDED"
		;;
	*)
		;;
esac

AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(void *)
AC_CHECK_SIZEOF(long long)

AC_DEFUN([AC_TYPEOF], [
  dnl * first check if we can get the size with redefining typedefs

  order="$2"
  if test "$2" = ""; then
    order="int long long-long"
  fi

  result=""
  visible="unknown"
  AC_MSG_CHECKING([type of $1])

  if test "x$ac_cv_c_compiler_gnu" = "xyes"; then
    dnl * try with printf() + -Werror
    old_CFLAGS="$CFLAGS"
    CFLAGS="$CFLAGS -Werror"

    for type in $order; do
      case "$type" in
        int)
	  fmt="%d"
	  ;;
        unsigned-int)
	  fmt="%u"
	  ;;
        long)
	  fmt="%ld"
	  ;;
        unsigned-long)
	  fmt="%lu"
	  ;;
        long-long)
	  fmt="%lld"
	  ;;
        unsigned-long-long)
	  fmt="%llu"
	  ;;
	*)
	  fmt=""
	  ;;
      esac

      if test "$fmt" != ""; then
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	  #include <sys/types.h>
	  #include <stdio.h>
	]], [[
	  printf("$fmt", ($1)0);
	]])],[
	  if test "$result" != ""; then
	    dnl * warning check isn't working
	    result=""
	    visible="unknown"
	    break
	  fi
	  result="`echo $type|sed 's/-/ /g'`"
	  visible="$result"
	],[])
      fi
    done
    CFLAGS="$old_CFLAGS"
  fi

  if test "$result" = ""; then
    for type in $order; do
      type="`echo $type|sed 's/-/ /g'`"
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <sys/types.h>
	typedef $type $1;
      ]], [[]])],[
	if test "$result" != ""; then
	  dnl * compiler allows redefining to anything
	  result=""
	  visible="unknown"
	  break
	fi
	result="$type"
	visible="$type"
      ],[])
    done
  fi

  if test "$result" = ""; then
    dnl * check with sizes

    dnl * older autoconfs don't include sys/types.h, so do it manually
    AC_RUN_IFELSE([AC_LANG_SOURCE([[
      #include <stdio.h>
      #include <sys/types.h>
      int main() {
	FILE *f=fopen("conftestval", "w");
	if (!f) exit(1);
	fprintf(f, "%d\n", sizeof($1));
	exit(0);
      }
    ]])],[
      size=`cat conftestval`
      rm -f conftestval

      for type in $order; do
        actype="ac_cv_sizeof_`echo $type|sed 's/-/_/g'`"
        if test "$size" = "`eval echo \\$$actype`"; then
	  result="`echo $type|sed 's/-/ /g'`"
	  visible="`expr $size \* 8`bit (using $result)"
	  break
	fi
      done
      if test "$result" = ""; then
        result=unknown
	visible="`expr $size \* 8`bit (unknown type)"
      fi
    ],[],[])
  fi

  typeof_$1=$result
  AC_MSG_RESULT($visible)
])

dnl * off_t checks, try to make it 64bit
AC_DEFINE_UNQUOTED(_FILE_OFFSET_BITS, $preferred_off_t_bits,
  [If set to 64, enables 64bit off_t for some systems (eg. Linux, Solaris)])

AC_CHECK_TYPES(_Bool)

AC_CHECK_TYPE(uoff_t, [
  have_uoff_t=yes
  AC_DEFINE(HAVE_UOFF_T,, Define if you have a native uoff_t type)
], [
  have_uoff_t=no
])

AC_TYPEOF(off_t, long int long-long)
case "$typeof_off_t" in
  int)
    offt_max=INT_MAX
    uofft_fmt="u"
    if test "$have_uoff_t" != "yes"; then
      AC_DEFINE(UOFF_T_INT,, Define if off_t is int)
    fi
    offt_bits=`expr 8 \* $ac_cv_sizeof_int`
    ;;
  long)
    offt_max=LONG_MAX
    uofft_fmt="lu"
    if test "$have_uoff_t" != "yes"; then
      AC_DEFINE(UOFF_T_LONG,, Define if off_t is long)
    fi
    offt_bits=`expr 8 \* $ac_cv_sizeof_long`
    ;;
  "long long")
    offt_max=LLONG_MAX
    uofft_fmt="llu"
    if test "$have_uoff_t" != "yes"; then
      AC_DEFINE(UOFF_T_LONG_LONG,, Define if off_t is long long)
    fi
    offt_bits=`expr 8 \* $ac_cv_sizeof_long_long`
    ;;
  *)
    AC_MSG_ERROR([Unsupported off_t type])
    ;;
esac

dnl * Do we have struct dirent->d_type
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  #include <dirent.h>
]], [[
  struct dirent d;
  d.d_type = DT_DIR;
]])],[
  AC_DEFINE(HAVE_DIRENT_D_TYPE,, Define if you have struct dirent->d_type)
],[])

dnl * Do we have OFF_T_MAX?
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  #include <limits.h>
  #include <sys/types.h>
]], [[
  off_t i = OFF_T_MAX;
]])],[
  :
],[
  AC_DEFINE_UNQUOTED(OFF_T_MAX, $offt_max, Maximum value of off_t)
])

AC_DEFINE_UNQUOTED(PRIuUOFF_T, "$uofft_fmt", printf() format for uoff_t)

dnl * make sure size_t isn't signed. we'd probably work fine with it, but
dnl * it's more likely vulnerable to buffer overflows. Anyway, C99 specifies
dnl * that it's unsigned and only some old systems define it as signed.
AC_MSG_CHECKING([whether size_t is signed])
AC_RUN_IFELSE([AC_LANG_SOURCE([[
  #include <sys/types.h>
  int main() {
    /* return 0 if we're signed */
    exit((size_t)(int)-1 <= 0 ? 0 : 1);
  }
]])],[
  AC_MSG_RESULT(yes)

  echo
  echo "Your system's size_t is a signed integer, Dovecot isn't designed to"
  echo "support it. It probably works just fine, but it's less resistant to"
  echo "buffer overflows. If you're not worried about this and still want to"
  echo "compile Dovecot, set ignore_signed_size=1 environment."

  if test "$ignore_signed_size" = ""; then
    AC_MSG_ERROR([aborting])
  fi
  echo "..ignoring as requested.."
],[
  AC_MSG_RESULT(no)
],[])

dnl Note: we check size_t rather than ssize_t here, because on OSX 10.2
dnl ssize_t = int and size_t = unsigned long. We're mostly concerned about
dnl printf format here, so check the size_t one.
AC_TYPEOF(size_t, unsigned-int unsigned-long unsigned-long-long)
case "$typeof_size_t" in
  "unsigned long")
    ssizet_max=LONG_MAX
    sizet_fmt="lu"
    ;;
  "unsigned long long")
    ssizet_max=LLONG_MAX
    sizet_fmt="llu"
    ;;
  *)
    dnl older systems didn't have ssize_t, default to int
    ssizet_max=INT_MAX
    sizet_fmt="u"

    if test "$typeof_size_t" = ""; then
      AC_DEFINE(size_t, unsigned int, Define to 'unsigned int' if you don't have it)
      AC_DEFINE(ssize_t, int, Define to 'int' if you don't have it)
    fi
    ;;
esac

AC_DEFINE_UNQUOTED(SSIZE_T_MAX, $ssizet_max, Maximum value of ssize_t)
AC_DEFINE_UNQUOTED(PRIuSIZE_T, "$sizet_fmt", printf() format for size_t)

AC_DEFUN([AC_CHECKTYPE2], [
  AC_MSG_CHECKING([for $1])
  AC_CACHE_VAL(i_cv_type_$1,
  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  #include <sys/types.h>
  $2]], [[$1 t;]])],[i_cv_type_$1=yes],[i_cv_type_$1=no])])
  AC_MSG_RESULT($i_cv_type_$1)
])

dnl some systems don't have stdint.h, but still have some of the types
dnl defined elsewhere
AC_CHECK_HEADER(stdint.h, [
  stdint_include="#include <stdint.h>"
])

AC_CHECKTYPE2(uintmax_t, [$stdint_include])
if test $i_cv_type_uintmax_t = yes; then
  AC_DEFINE(HAVE_UINTMAX_T,, Define if you have uintmax_t (C99 type))
fi

dnl use separate check, eg. Solaris 8 has uintmax_t but not uint_fast32_t
AC_CHECKTYPE2(uint_fast32_t, [$stdint_include])
if test $i_cv_type_uint_fast32_t = yes; then
  AC_DEFINE(HAVE_UINT_FAST32_T,, Define if you have uint_fast32_t (C99 type))
fi

AC_CHECKTYPE2(socklen_t, [#include <sys/socket.h>])
if test $i_cv_type_socklen_t = yes; then
  AC_DEFINE(HAVE_SOCKLEN_T,, Define to 'int' if you don't have socklen_t)
fi

AC_DEFINE_UNQUOTED(MEM_ALIGN_SIZE, $mem_align, Required memory alignment)

dnl * find random source
AC_MSG_CHECKING([for /dev/urandom])
if test -c /dev/urandom || test -s /dev/urandom; then
  AC_MSG_RESULT(yes)
  AC_DEFINE(HAVE_DEV_URANDOM,, Define if you have /dev/urandom)
  have_random_source=yes
else
  AC_MSG_RESULT(no)

  AC_CHECK_HEADER(openssl/rand.h, [
    AC_DEFINE(HAVE_OPENSSL_RAND_H,, Define if you have openssl/rand.h)
    RAND_LIBS=-lcrypto
  ])
fi
AC_SUBST(RAND_LIBS)

dnl * do we have tm_gmtoff
AC_MSG_CHECKING([for tm_gmtoff])
AC_CACHE_VAL(i_cv_field_tm_gmtoff,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <time.h>]],
[[struct tm *tm; return tm->tm_gmtoff;]])],
[i_cv_field_tm_gmtoff=yes],
[i_cv_field_tm_gmtoff=no])])
if test $i_cv_field_tm_gmtoff = yes; then
	AC_DEFINE(HAVE_TM_GMTOFF,, Define if you have struct tm->tm_gmtoff)
fi
AC_MSG_RESULT($i_cv_field_tm_gmtoff)

dnl * how large time_t values does gmtime() accept?
AC_MSG_CHECKING([how large time_t values gmtime() accepts])
AC_RUN_IFELSE([AC_LANG_SOURCE([[
  #include <stdio.h>
  #include <time.h>
  int main() {
    FILE *f;
    int bits;
    time_t t;

    for (bits = 1, t = 1; t > 0; ++bits, t <<= 1) {
      if (gmtime(&t) == NULL) {
        bits--;
	break;
      }
    }
    if (bits > 40) {
      /* Solaris 9 breaks after 55 bits. Perhaps other systems break earlier.
         Let's just do the same as Cyrus folks and limit it to 40 bits. */
      bits = 40;
    }

    f = fopen("conftest.temp", "w");
    if (f == NULL) {
      perror("fopen()");
      return 1;
    }
    fprintf(f, "%d", bits);
    fclose(f);
    return 0;
  }
]])],[
  max_bits=`cat conftest.temp`
  rm -f conftest.temp
  AC_MSG_RESULT($max_bits)
], [
  AC_MSG_RESULT([check failed, assuming 31])
  max_bits=31
],[])
AC_DEFINE_UNQUOTED(TIME_T_MAX_BITS, $max_bits, max. time_t bits gmtime() can handle)

dnl * do we have struct iovec
AC_MSG_CHECKING([for struct iovec])
AC_CACHE_VAL(i_cv_struct_iovec,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>]],
[[struct iovec *iovec;]])],
[i_cv_struct_iovec=yes],
[i_cv_struct_iovec=no])])

if test $i_cv_struct_iovec = yes; then
	AC_DEFINE(HAVE_STRUCT_IOVEC,, Define if you have struct iovec)
fi
AC_MSG_RESULT($i_cv_struct_iovec)

dnl * is dev_t an integer or something else?
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  #include <sys/types.h>
  struct test { dev_t a; };
  static struct test t = { 0 };
]], [[]])],[],[
  AC_DEFINE(DEV_T_STRUCT,, Define if your dev_t is a structure instead of integer type)

  dnl we can't initialize structures, so don't warn about them either
  if test "x$ac_cv_c_compiler_gnu" = "xyes"; then
    CFLAGS=`echo $CFLAGS|sed 's/ -W\b//'`
  fi
])

dnl * Do we have RLIMIT_AS?
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  #include <sys/types.h>
  #include <sys/time.h>
  #include <sys/resource.h>
]], [[
  struct rlimit r;
  getrlimit(RLIMIT_AS, &r);
]])],[
  AC_DEFINE(HAVE_RLIMIT_AS,, Define if you have RLIMIT_AS for setrlimit())
],[])

dnl * Do we have RLIMIT_NPROC?
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  #include <sys/types.h>
  #include <sys/time.h>
  #include <sys/resource.h>
]], [[
  struct rlimit r;
  getrlimit(RLIMIT_NPROC, &r);
]])],[
  AC_DEFINE(HAVE_RLIMIT_NPROC,, Define if you have RLIMIT_NPROC for setrlimit())
],[])

dnl * Linux compatible mremap()
AC_MSG_CHECKING([Linux compatible mremap()])
AC_TRY_LINK([
  #include <unistd.h>
  #define __USE_GNU
  #include <sys/mman.h>
], [
  mremap(0, 0, 0, MREMAP_MAYMOVE);
], [
  AC_DEFINE(HAVE_LINUX_MREMAP,, Define if you have Linux-compatible mremap())
  AC_MSG_RESULT(yes)
], [
  AC_MSG_RESULT(no)
])

dnl * If mmap() plays nicely with write()
AC_MSG_CHECKING([whether shared mmaps get updated by write()s])
AC_TRY_RUN([
  #include <stdio.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <unistd.h>
  #include <fcntl.h>
  #include <sys/mman.h>
  int main() {
    /* return 0 if we're signed */
    int f = open("conftest.mmap", O_RDWR|O_CREAT|O_TRUNC);
    void *mem;
    if (f == -1) {
      perror("open()");
      return 1;
    }
    unlink("conftest.mmap");

    write(f, "1", 2);
    mem = mmap(NULL, 2, PROT_READ|PROT_WRITE, MAP_SHARED, f, 0);
    if (mem == MAP_FAILED) {
      perror("mmap()");
      return 1;
    }
    strcpy(mem, "2");
    msync(mem, 2, MS_SYNC);
    lseek(f, 0, SEEK_SET);
    write(f, "3", 2);
  
    return strcmp(mem, "3") == 0 ? 0 : 1;
  }
], [
  AC_MSG_RESULT(yes)
], [
  AC_MSG_RESULT(no)
  AC_DEFINE(MMAP_CONFLICTS_WRITE,, [Define if shared mmaps don't get updated by write()s])
])

dnl * see if fd passing works
AC_MSG_CHECKING([whether fd passing works])
for i in 1 2; do
  old_cflags="$CFLAGS"
  CFLAGS="$CFLAGS -I$srcdir/src/lib $srcdir/src/lib/fdpass.c"
  if test $i = 2; then
    CFLAGS="$CFLAGS -DBUGGY_CMSG_MACROS"
  fi

  AC_TRY_RUN([
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <sys/wait.h>
    #include <sys/stat.h>
    #include <unistd.h>
    #include <fcntl.h>
    #include "fdpass.h"
    
    int main(void)
    {
	    int fd[2], send_fd, recv_fd, status;
	    struct stat st, st2;
	    char data;
    
	    send_fd = open("conftest.fdpass", O_CREAT|O_WRONLY);
	    if (send_fd == -1) return 2;
	    unlink("conftest.fdpass");
	    if (fstat(send_fd, &st) < 0) return 2;
	    if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0) return 2;
    
	    switch (fork()) {
	    case -1:
		    return 2;
	    case 0:
		    alarm(1);
		    if (fd_send(fd[0], send_fd, &data, 1) != 1) return 2;
		    return 0;
	    default:
		    alarm(2);
		    if (wait(&status) == -1)
		      return 2;
		    if (status != 0)
		      return status;
		    if (fd_read(fd[1], &data, 1, &recv_fd) != 1) return 1;
		    if (fstat(recv_fd, &st2) < 0) return 2;
		    return st.st_ino == st2.st_ino ? 0 : 1;
	    }
    }
  ], [
    CFLAGS=$old_cflags
    if test $i = 2; then
      AC_DEFINE(BUGGY_CMSG_MACROS,, Define if you have buggy CMSG macros)
    fi
    AC_MSG_RESULT(yes)
    break
  ], [
    dnl no, try with BUGGY_CMSG_MACROS
    CFLAGS=$old_cflags
    if test $i = 2; then
      AC_MSG_RESULT(no)
    fi
  ])
done

dnl * Solaris compatible sendfile()
AC_CHECK_LIB(sendfile, sendfile, [
  LIBS="$LIBS -lsendfile"
  AC_DEFINE(HAVE_SOLARIS_SENDFILE,, Define if you have Solaris-compatible sendfile())
], [
  dnl * Linux compatible sendfile() - don't check if Solaris one was found.
  dnl * This seems to pass with Solaris for some reason..
  AC_MSG_CHECKING([Linux compatible sendfile()])
  AC_TRY_LINK([
    #undef _FILE_OFFSET_BITS
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <sys/sendfile.h>
  ], [
    sendfile(0, 0, (void *) 0, 0);
  ], [
    AC_DEFINE(HAVE_LINUX_SENDFILE,, Define if you have Linux-compatible sendfile())
    AC_MSG_RESULT(yes)
  ], [
    AC_MSG_RESULT(no)
  ])

  dnl * FreeBSD compatible sendfile()
  AC_MSG_CHECKING([FreeBSD compatible sendfile()])
  AC_TRY_LINK([
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <sys/uio.h>
  ], [
    struct sf_hdtr hdtr;
    sendfile(0, 0, 0, 0, &hdtr, (void *) 0, 0);
  ], [
    AC_DEFINE(HAVE_FREEBSD_SENDFILE,, Define if you have FreeBSD-compatible sendfile())
    AC_MSG_RESULT(yes)
  ], [
    AC_MSG_RESULT(no)
  ])
])

dnl * Check for crypt() if unistd.h compiles with _XOPEN_SOURCE + _XPG6
dnl * Add other macros there too "just in case".
AC_MSG_CHECKING([if we should use _XPG6 macro for crypt()])
AC_TRY_COMPILE([
  #define _XOPEN_SOURCE 4
  #define _XOPEN_SOURCE_EXTENDED 1
  #define _XOPEN_VERSION 4
  #define _XPG4_2
  #define _XPG6
  #include <unistd.h>
], [
  crypt("a", "b");
], [
  AC_DEFINE(CRYPT_USE_XPG6,, Define if _XPG6 macro is needed for crypt())
  AC_MSG_RESULT(yes)
], [
  AC_MSG_RESULT(no)
])

dnl * Check if statvfs() can be used to find out block device for files
AC_MSG_CHECKING([if statvfs.f_mntfromname exists])
AC_TRY_COMPILE([
  #include <sys/types.h>
  #include <sys/statvfs.h>
], [
  struct statvfs buf;
  char *p = buf.f_mntfromname;

  statvfs(".", &buf);
], [
  AC_DEFINE(HAVE_STATVFS_MNTFROMNAME,, Define if you have statvfs.f_mntfromname)
  AC_MSG_RESULT(yes)
], [
  AC_MSG_RESULT(no)
])

dnl * Check if statfs() can be used to find out block device for files
AC_MSG_CHECKING([if statfs.f_mntfromname exists])
AC_TRY_COMPILE([
  #include <sys/param.h>
  #include <sys/mount.h>
], [
  struct statfs buf;
  char *p = buf.f_mntfromname;

  statfs(".", &buf);
], [
  AC_DEFINE(HAVE_STATFS_MNTFROMNAME,, Define if you have statfs.f_mntfromname)
  AC_MSG_RESULT(yes)
], [
  AC_MSG_RESULT(no)
])

dnl * Check if we have struct dqblk.dqb_curblocks
AC_MSG_CHECKING([if struct dqblk.dqb_curblocks exists])
AC_TRY_COMPILE([
  #include <sys/types.h>
  #include "$srcdir/src/plugins/quota/quota-fs.h"
], [
  struct dqblk dqblk;
  unsigned int x = dqblk.dqb_curblocks;
], [
  AC_DEFINE(HAVE_STRUCT_DQBLK_CURBLOCKS,, Define if struct sqblk.dqb_curblocks exists)
  AC_MSG_RESULT(yes)
], [
  AC_MSG_RESULT(no)
])

dnl * Check if we have struct dqblk.dqb_curspace
AC_MSG_CHECKING([if struct dqblk.dqb_curspace exists])
AC_TRY_COMPILE([
  #include <sys/types.h>
  #include "$srcdir/src/plugins/quota/quota-fs.h"
], [
  struct dqblk dqblk;
  unsigned int x = dqblk.dqb_curspace;
], [
  AC_DEFINE(HAVE_STRUCT_DQBLK_CURSPACE,, Define if struct sqblk.dqb_curspace exists)
  AC_MSG_RESULT(yes)
], [
  AC_MSG_RESULT(no)
])

dnl * Check if we have Q_QUOTACTL ioctl (Solaris)
AC_MSG_CHECKING([if struct Q_QUOTACTL ioctl exists])
AC_TRY_COMPILE([
  #include <sys/types.h>
  #include <sys/fs/ufs_quota.h>
], [
  struct quotctl ctl;
  ioctl(0, Q_QUOTACTL, &ctl);
], [
  AC_DEFINE(HAVE_Q_QUOTACTL,, Define if Q_QUOTACTL exists)
  AC_MSG_RESULT(yes)
], [
  AC_MSG_RESULT(no)
])

dnl ***
dnl *** va_copy checks (from GLIB)
dnl ***

AC_CACHE_CHECK([for an implementation of va_copy()],lib_cv_va_copy,[
	AC_RUN_IFELSE([AC_LANG_SOURCE([[
	#include <stdarg.h>
	void f (int i, ...) {
	va_list args1, args2;
	va_start (args1, i);
	va_copy (args2, args1);
	if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
	  exit (1);
	va_end (args1); va_end (args2);
	}
	int main() {
	  f (0, 42);
	  return 0;
	}]])],
	[lib_cv_va_copy=yes],
	[lib_cv_va_copy=no],[])
])
AC_CACHE_CHECK([for an implementation of __va_copy()],lib_cv___va_copy,[
	AC_RUN_IFELSE([AC_LANG_SOURCE([[
	#include <stdarg.h>
	void f (int i, ...) {
	va_list args1, args2;
	va_start (args1, i);
	__va_copy (args2, args1);
	if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
	  exit (1);
	va_end (args1); va_end (args2);
	}
	int main() {
	  f (0, 42);
	  return 0;
	}]])],
	[lib_cv___va_copy=yes],
	[lib_cv___va_copy=no],[])
])

if test "x$lib_cv_va_copy" = "xyes"; then
  va_copy_func=va_copy
else if test "x$lib_cv___va_copy" = "xyes"; then
  va_copy_func=__va_copy
fi
fi

if test -n "$va_copy_func"; then
  AC_DEFINE_UNQUOTED(VA_COPY,$va_copy_func,[A 'va_copy' style function])
fi

AC_CACHE_CHECK([whether va_lists can be copied by value],lib_cv_va_val_copy,[
	AC_RUN_IFELSE([AC_LANG_SOURCE([[
	#include <stdarg.h>
	void f (int i, ...) {
	va_list args1, args2;
	va_start (args1, i);
	args2 = args1;
	if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
	  exit (1);
	va_end (args1); va_end (args2);
	}
	int main() {
	  f (0, 42);
	  return 0;
	}]])],
	[lib_cv_va_val_copy=yes],
	[lib_cv_va_val_copy=no],[])
])

if test "x$lib_cv_va_val_copy" = "xno"; then
  AC_DEFINE(VA_COPY_AS_ARRAY,1, ['va_lists' cannot be copies as values])
fi

dnl **
dnl ** SSL
dnl **

have_ssl=no

if test "$want_openssl" = "yes" && test "$have_ssl" = "no"; then
  if pkg-config --exists openssl 2>/dev/null; then
    PKG_CHECK_MODULES(SSL, openssl)
    CFLAGS="$CFLAGS $SSL_CFLAGS"
    have_openssl=yes
  else
    AC_CHECK_LIB(ssl, SSL_read, [
      AC_CHECK_HEADERS(openssl/ssl.h openssl/err.h, [
        SSL_LIBS="-lssl -lcrypto"
        AC_SUBST(SSL_LIBS)
	have_openssl=yes
      ])
    ],, -lcrypto)
  fi
  if test "$have_openssl" = "yes"; then
    AC_DEFINE(HAVE_OPENSSL,, Build with OpenSSL support)
    have_ssl="yes (OpenSSL)"
  fi
fi

if test $want_gnutls = yes && test "$have_ssl" = no; then
	AC_CHECK_LIB(gnutls, gnutls_global_init, [
		AC_CHECK_HEADERS(gnutls/gnutls.h, [
			AC_DEFINE(HAVE_GNUTLS,, Build with GNUTLS support)
			SSL_LIBS="-lgnutls -lgcrypt"
			AC_SUBST(SSL_LIBS)
			have_ssl="yes (GNUTLS)"
			have_gnutls=yes
		])
	],, -lgcrypt)
fi

if test "$have_ssl" != "no"; then
	AC_DEFINE(HAVE_SSL,, Build with SSL/TLS support)
fi

dnl **
dnl ** Garbage Collector
dnl ** 

if test "$want_gc" = "yes"; then
  AC_CHECK_LIB(gc, GC_malloc, [
    AC_CHECK_HEADERS(gc/gc.h gc.h)
    AC_DEFINE(USE_GC,, Define if you want to use Boehm GC)
    LIBS="$LIBS -lgc"
  ], [
    want_gc=no
  ])
fi

dnl **
dnl ** userdb and passdb checks
dnl **

need_crypt=no
userdb=""
passdb=""

if test $want_static_userdb = yes; then
	need_crypt=yes
        AC_DEFINE(USERDB_STATIC,, Build with static userdb support)
	userdb="$userdb static"
fi

if test $want_prefetch_userdb = yes; then
        AC_DEFINE(USERDB_PREFETCH,, Build with prefetch userdb support)
	userdb="$userdb prefetch"
fi

if test $want_passwd = yes; then
	need_crypt=yes
        AC_DEFINE(USERDB_PASSWD,, Build with passwd support)
        AC_DEFINE(PASSDB_PASSWD,, Build with passwd support)
	userdb="$userdb passwd"
	passdb="$passdb passwd"
fi

if test $want_passwd_file = yes; then
	need_crypt=yes
        AC_DEFINE(USERDB_PASSWD_FILE,, Build with passwd-file support)
        AC_DEFINE(PASSDB_PASSWD_FILE,, Build with passwd-file support)
	userdb="$userdb passwd-file"
	passdb="$passdb passwd-file"
fi

if test $want_shadow = yes; then
	AC_CHECK_FUNC(getspnam, [
		AC_CHECK_HEADER(shadow.h, [
			need_crypt=yes
			AC_DEFINE(PASSDB_SHADOW,, Build with shadow support)
			passdb="$passdb shadow"
		])
	])
fi

if test $want_pam = yes; then
	AC_CHECK_LIB(pam, pam_start, [
		have_pam=no
		AC_CHECK_HEADER(security/pam_appl.h, [
			AC_DEFINE(HAVE_SECURITY_PAM_APPL_H,,
				  Define if you have security/pam_appl.h)
			have_pam=yes
		])

		AC_CHECK_HEADER(pam/pam_appl.h, [
			AC_DEFINE(HAVE_PAM_PAM_APPL_H,,
				  Define if you have pam/pam_appl.h)
			have_pam=yes
		])

		if test "$have_pam" = "yes"; then
			AUTH_LIBS="$AUTH_LIBS -lpam"
			AC_DEFINE(PASSDB_PAM,, Build with PAM support)
			passdb="$passdb pam"

			AC_CHECK_LIB(pam, pam_setcred, [
				AC_DEFINE(HAVE_PAM_SETCRED,,
					  Define if you have pam_setcred())
			])
		fi
	])
fi

if test $want_checkpassword = yes; then
        AC_DEFINE(USERDB_CHECKPASSWORD,, Build with checkpassword userdb support)
        AC_DEFINE(PASSDB_CHECKPASSWORD,, Build with checkpassword passdb support)
	userdb="$userdb checkpassword"
	passdb="$passdb checkpassword"
fi

if test $want_bsdauth = yes; then
	AC_CHECK_FUNC(auth_userokay, [
		AC_DEFINE(PASSDB_BSDAUTH,, Build with BSD authentication support)
		passdb="$passdb bsdauth"
	])
fi

have_gssapi=no
if test $want_gssapi = yes; then
	AC_CHECK_PROG(KRB5CONFIG, krb5-config, YES, NO)
	if test $KRB5CONFIG = YES; then
		# we have a kludgy check here to check that we have
		# version >= v1.3. Although this doesn't work right with
		# non-MIT kerberos versioning..
		if `krb5-config --version|grep -qv '1\.2'`; then
			AUTH_LIBS="$AUTH_LIBS `krb5-config --libs gssapi`"
			AUTH_CFLAGS="$AUTH_CFLAGS `krb5-config --cflags gssapi`"
			
			# Although krb5-config exists, all systems still don't
			# have gssapi.h
			old_CFLAGS=$CFLAGS
			CFLAGS="$CFLAGS `krb5-config --cflags gssapi`"
			AC_CHECK_HEADER([gssapi/gssapi.h], [
				AC_DEFINE(HAVE_GSSAPI,, Build with GSSAPI support)
				have_gssapi=yes
			])
			CFLAGS=$old_CFLAGS
		fi
	fi
fi

if test $want_sia = yes; then
	AC_CHECK_FUNC(sia_validate_user, [
		AC_DEFINE(PASSDB_SIA,, Build with Tru64 SIA support)
		passdb="$passdb sia"
		AUTH_LIBS="$AUTH_LIBS -depth_ring_search"
	])
fi

if test $want_ldap = yes; then
	AC_CHECK_LIB(ldap, ldap_init, [
		AC_CHECK_HEADER(ldap.h, [
			AC_CHECK_LIB(ldap, ldap_initialize, [
				AC_DEFINE(LDAP_HAVE_INITIALIZE,, Define if you have ldap_initialize)
			])
			AC_CHECK_LIB(ldap, ldap_start_tls_s, [
				AC_DEFINE(LDAP_HAVE_START_TLS_S,, Define if you have ldap_start_tls_s)
			])
			AUTH_LIBS="$AUTH_LIBS -lldap"

        		AC_DEFINE(USERDB_LDAP,, Build with LDAP support)
		        AC_DEFINE(PASSDB_LDAP,, Build with LDAP support)
			userdb="$userdb ldap"
			passdb="$passdb ldap"
		])
	])
fi

if test $want_pgsql = yes; then
	# based on code from PHP
	for i in /usr /usr/local /usr/local/pgsql; do
		for j in include include/pgsql include/postgres include/postgresql ""; do
			if test -r "$i/$j/libpq-fe.h"; then
				PGSQL_INCLUDE=$i/$j
			fi
		done
		for lib in lib lib64; do
		  for j in $lib $lib/pgsql $lib/postgres $lib/postgresql ""; do
			if test -f "$i/$j/libpq.so" || test -f "$i/$j/libpq.a"; then
				PGSQL_LIBDIR=$i/$j
			fi
		  done
		done
	done

	old_LIBS=$LIBS
	if test "$PGSQL_LIBDIR" != ""; then
		LIBS="$LIBS -L$PGSQL_LIBDIR"
	fi

	AC_CHECK_LIB(pq, PQconnectdb, [
		AC_CHECK_LIB(pq, PQescapeStringConn, [
			AC_DEFINE(HAVE_PQESCAPE_STRING_CONN,, Define if libpq has PQescapeStringConn function)
		])
		old_CPPFLAGS=$CPPFLAGS
		if test "$PGSQL_INCLUDE" != ""; then
			CPPFLAGS="$CPPFLAGS -I $PGSQL_INCLUDE"
		fi
		AC_CHECK_HEADER(libpq-fe.h, [
			if test "$PGSQL_INCLUDE" != ""; then
				SQL_CFLAGS="$SQL_CFLAGS -I$PGSQL_INCLUDE"
			fi
			if test "$PGSQL_LIBDIR" != ""; then
				SQL_LIBS="$SQL_LIBS -L$PGSQL_LIBDIR"
			fi
			SQL_LIBS="$SQL_LIBS -lpq"
			AC_DEFINE(HAVE_PGSQL,, Build with PostgreSQL support)
			found_sql_drivers="$found_sql_drivers pgsql"

                        if test "$all_sql_drivers" = "yes"; then
			  sql_drivers="$sql_drivers pgsql"
			fi
		])
		CPPFLAGS=$old_CPPFLAGS
	])
	LIBS=$old_LIBS
fi

if test $want_mysql = yes; then
	# based on code from PHP
	for i in /usr /usr/local /usr/local/mysql; do
		for j in include include/mysql ""; do
			if test -r "$i/$j/mysql.h"; then
				MYSQL_INCLUDE=$i/$j
			fi
		done
		for j in lib lib/mysql lib64 lib64/mysql ""; do
			if test -f "$i/$j/libmysqlclient.so" || test -f "$i/$j/libmysqlclient.a"; then
				MYSQL_LIBDIR=$i/$j
			fi
		done
	done

	old_LIBS=$LIBS
	if test "$MYSQL_LIBDIR" != ""; then
		LIBS="$LIBS -L$MYSQL_LIBDIR"
	fi

	mysql_lib=""
	LIBS="$LIBS -lz -lm"
	AC_CHECK_LIB(mysqlclient, mysql_init, [
		mysql_lib="-lmysqlclient -lz -lm"
	])

	if test "$mysql_lib" != ""; then
		old_CPPFLAGS=$CPPFLAGS
		if test "$MYSQL_INCLUDE" != ""; then
			CPPFLAGS="$CPPFLAGS -I $MYSQL_INCLUDE"
		fi
		AC_CHECK_HEADER(mysql.h, [
			if test "$MYSQL_INCLUDE" != ""; then
				SQL_CFLAGS="$SQL_CFLAGS -I$MYSQL_INCLUDE"
			fi
			if test "$MYSQL_LIBDIR" != ""; then
				SQL_LIBS="$SQL_LIBS -L$MYSQL_LIBDIR"
			fi
			SQL_LIBS="$SQL_LIBS $mysql_lib"

			AC_CHECK_LIB(mysqlclient, mysql_ssl_set, [
				AC_DEFINE(HAVE_MYSQL_SSL,, Define if your MySQL library has SSL functions)
				if test "x$have_openssl" = "yes"; then
				  ssl_define="#define HAVE_OPENSSL"
				else
				  ssl_define=""
				fi
				AC_TRY_COMPILE([
				  $ssl_define
				  #include <mysql.h>
				], [
				  mysql_set_ssl(0, 0, 0, 0, 0, 0);
				], [
					AC_DEFINE(HAVE_MYSQL_SSL_CIPHER,, Define if your MySQL library supports setting cipher)
				])
			])
			
			AC_DEFINE(HAVE_MYSQL,, Build with MySQL support)
			found_sql_drivers="$found_sql_drivers mysql"
		])
		CPPFLAGS=$old_CPPFLAGS
	fi

	LIBS=$old_LIBS
fi

if test $want_sqlite = yes; then
	AC_CHECK_LIB(sqlite3, sqlite3_open, [
		AC_CHECK_HEADER(sqlite3.h, [
			SQL_LIBS="$SQL_LIBS -lsqlite3 -lz"

			AC_DEFINE(HAVE_SQLITE,, Build with SQLite3 support)
			found_sql_drivers="$found_sql_drivers sqlite"
		])
	])
fi

if test "$found_sql_drivers" != "" -o "$want_sql" = "yes"; then
	if test "$all_sql_drivers" = "yes"; then
	  sql_drivers="$found_sql_drivers"
	fi

	AC_DEFINE(PASSDB_SQL,, Build with SQL support)
	AC_DEFINE(USERDB_SQL,, Build with SQL support)
	AUTH_LIBS="$AUTH_LIBS $SQL_LIBS"
	passdb="$passdb sql"
	userdb="$userdb sql"
fi

if test $want_vpopmail = yes; then
	vpopmail_home="`echo ~vpopmail`"
	vpop_libdeps="$vpopmail_home/etc/lib_deps"

	AC_MSG_CHECKING([for vpopmail configuration at $vpop_libdeps])
	if test -f $vpop_libdeps; then
		need_crypt=yes
		AUTH_CFLAGS="$AUTH_CFLAGS `cat $vpopmail_home/etc/inc_deps` $CFLAGS"
		AUTH_LIBS="$AUTH_LIBS `cat $vpop_libdeps`"
		AC_DEFINE(USERDB_VPOPMAIL,, Build with vpopmail support)
		AC_DEFINE(PASSDB_VPOPMAIL,, Build with vpopmail support)
		userdb="$userdb vpopmail"
		passdb="$passdb vpopmail"
		AC_MSG_RESULT(found)
	else
		want_vpopmail=no
		AC_MSG_RESULT(not found)
	fi
fi

if test $need_crypt = yes; then
	AC_CHECK_LIB(crypt, crypt, [
		AUTH_LIBS="-lcrypt $AUTH_LIBS"
	], [
		AC_CHECK_FUNC(crypt,, [
			AC_MSG_ERROR([crypt() wasn't found])
		])
	])
fi

dnl * dynamic modules?
have_modules=no
AC_CHECK_FUNC(dlopen, [
  have_modules=yes
  MODULE_LIBS="-export-dynamic"
], [
  AC_CHECK_LIB(dl, dlopen, [
    have_modules=yes
    MODULE_LIBS="-export-dynamic -ldl"
  ])
])

if test $have_modules = yes; then
  AC_DEFINE(HAVE_MODULES,, Define if you have dynamic module support)
  userdb="$userdb (modules)"
  passdb="$passdb (modules)"

  AC_SUBST(MODULE_LIBS)
fi

AC_SUBST(AUTH_CFLAGS)
AC_SUBST(AUTH_LIBS)
AC_SUBST(SQL_CFLAGS)
AC_SUBST(SQL_LIBS)

dnl **
dnl ** Index file compatibility flags
dnl **

dnl * currently just checking for endianess

AC_C_BIGENDIAN

if test $ac_cv_c_bigendian = yes; then
	flags=0
else
	flags=1
fi

AC_DEFINE_UNQUOTED(MAIL_INDEX_COMPAT_FLAGS, $flags, Index file compatibility flags)

dnl **
dnl ** IPv6 support
dnl **

if test "x$want_ipv6" = "xyes"; then
	AC_MSG_CHECKING([for IPv6])
	AC_CACHE_VAL(i_cv_type_in6_addr,
	[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <netinet/in.h>
	#include <netdb.h>
	#include <arpa/inet.h>]],
	[[struct in6_addr i;]])],
	[i_cv_type_in6_addr=yes],
	[i_cv_type_in6_addr=no])])
	if test $i_cv_type_in6_addr = yes; then
		AC_DEFINE(HAVE_IPV6,, Build with IPv6 support)
	fi
	AC_MSG_RESULT($i_cv_type_in6_addr)
fi

dnl **
dnl ** storage classes
dnl **

maildir_libs='$(top_builddir)/src/lib-storage/index/maildir/libstorage_maildir.a'
mbox_libs='$(top_builddir)/src/lib-storage/index/mbox/libstorage_mbox.a'
dbox_libs='$(top_builddir)/src/lib-storage/index/dbox/libstorage_dbox.a'
index_libs='$(top_builddir)/src/lib-storage/index/libstorage_index.a $(top_builddir)/src/lib-index/libindex.a'

deliver_storage="mbox"
STORAGE_LIBS=
for storage in $mail_storages; do
  if test "$storage" = "$deliver_storage"; then
    deliver_storage=""
  fi
  STORAGE_LIBS="$STORAGE_LIBS `eval echo \\$${storage}_libs`"
done
STORAGE_LIBS="$STORAGE_LIBS $index_libs"
AC_SUBST(STORAGE_LIBS)

if test -n "$deliver_storage" && test "$want_deliver" = yes; then
  AC_ERROR([If you remove mbox from storages, you need to build --without-deliver])
fi

dnl **
dnl ** SQL drivers
dnl **

for driver in $sql_drivers; do
  if test "$driver" = "pgsql"; then
    AC_DEFINE(BUILD_PGSQL,, Built-in PostgreSQL support)
  elif test "$driver" = "mysql"; then
    AC_DEFINE(BUILD_MYSQL,, Built-in MySQL support)
  elif test "$driver" = "sqlite"; then
    AC_DEFINE(BUILD_SQLITE,, Built-in SQLite support)
  fi
done

AC_SUBST(sql_drivers)

dnl **
dnl ** Plugins
dnl **

have_zlib=no
AC_CHECK_HEADER(zlib.h, [
  have_zlib=yes
])
AM_CONDITIONAL(BUILD_ZLIB, test "$have_zlib" = "yes")

dnl **
dnl ** capabilities
dnl **

capability="IMAP4rev1 SASL-IR SORT THREAD=REFERENCES MULTIAPPEND UNSELECT LITERAL+ IDLE CHILDREN NAMESPACE LOGIN-REFERRALS"
AC_DEFINE_UNQUOTED(CAPABILITY_STRING, "$capability", IMAP capabilities)

CFLAGS="$CFLAGS $EXTRA_CFLAGS"

AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([
Makefile
doc/Makefile
src/Makefile
src/lib/Makefile
src/lib-sql/Makefile
src/lib-auth/Makefile
src/lib-charset/Makefile
src/lib-dict/Makefile
src/lib-imap/Makefile
src/lib-index/Makefile
src/lib-mail/Makefile
src/lib-ntlm/Makefile
src/lib-settings/Makefile
src/lib-storage/Makefile
src/lib-storage/index/Makefile
src/lib-storage/index/maildir/Makefile
src/lib-storage/index/mbox/Makefile
src/lib-storage/index/dbox/Makefile
src/lib-storage/subscription-file/Makefile
src/lib-storage/register/Makefile
src/auth/Makefile
src/deliver/Makefile
src/dict/Makefile
src/imap/Makefile
src/imap-login/Makefile
src/login-common/Makefile
src/master/Makefile
src/pop3/Makefile
src/pop3-login/Makefile
src/util/Makefile
src/plugins/Makefile
src/plugins/acl/Makefile
src/plugins/convert/Makefile
src/plugins/quota/Makefile
src/plugins/imap-quota/Makefile
src/plugins/trash/Makefile
src/plugins/zlib/Makefile
stamp.h
dovecot-config.in])

AC_OUTPUT

echo
echo "Install prefix ...................... : $prefix"
echo "File offsets ........................ : ${offt_bits}bit"
echo "I/O loop method ..................... : $ioloop"
echo "File change notification method ..... : $have_notify"
echo "Building with SSL support ........... : $have_ssl"
echo "Building with IPv6 support .......... : $want_ipv6"
echo "Building with pop3 server ........... : $want_pop3d"
echo "Building with mail delivery agent  .. : $want_deliver"
echo "Building with GSSAPI support ........ : $have_gssapi"
echo "Building with user database modules . :$userdb"
echo "Building with password lookup modules :$passdb"
echo "Building with SQL drivers ............:$sql_drivers"