diff --git a/Makefile.in b/Makefile.in
index a9769bc..58e767e 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -109,3 +109,8 @@
 key:
 	dd if=/dev/urandom bs=56 count=1 of=piler.key
 
+postinstall:
+	@sh util/postinstall.sh $(RUNNING_USER) $(RUNNING_GROUP) $(sysconfdir) $(localstatedir)
+
+
+
diff --git a/etc/sphinx.conf b/etc/sphinx.conf
deleted file mode 100644
index 734a5c9..0000000
--- a/etc/sphinx.conf
+++ /dev/null
@@ -1,144 +0,0 @@
-#
-# Minimal Sphinx configuration sample (clean, simple, functional)
-#
-
-source base
-{
-   type = mysql
-   sql_host = localhost
-   sql_db = piler
-   sql_user = piler
-   sql_pass = piler
-}
-
-source main : base
-{
-   sql_query_pre = SET NAMES utf8
-   sql_query = SELECT id, `from`, `to`, `fromdomain`, `todomain`, `subject`, `arrived`, `sent`, `body`, `size`, `direction`, `folder`, `attachments`, `attachment_types` FROM sph_index \
-        WHERE id<=( SELECT max_doc_id FROM sph_counter WHERE counter_id=1 )
-
-   sql_attr_uint = size
-   sql_attr_uint = arrived
-   sql_attr_uint = sent
-   sql_attr_uint = direction
-   sql_attr_uint = folder
-   sql_attr_uint = attachments
-
-}
-
-
-source delta : base
-{
-   sql_query_pre = SET NAMES utf8
-   sql_query_pre  = REPLACE INTO sph_counter SELECT 1, MAX(id) FROM sph_index
-   sql_query_post_index  = DELETE FROM sph_index WHERE id<=(SELECT max_doc_id FROM sph_counter WHERE counter_id=1)
-   sql_query = SELECT id, `from`, `to`, `fromdomain`, `todomain`, `subject`, `arrived`, `sent`, `body`, `size`, `direction`, `folder`, `attachments`, `attachment_types` FROM sph_index \
-        WHERE id <= (SELECT max_doc_id FROM sph_counter WHERE counter_id=1)
-
-   sql_attr_uint = size
-   sql_attr_uint = arrived
-   sql_attr_uint = sent
-   sql_attr_uint = direction
-   sql_attr_uint = folder
-   sql_attr_uint = attachments
-
-   sql_query_killlist = SELECT `id` FROM `metadata` WHERE `deleted`=1
-
-}
-
-
-source tag : base
-{
-   sql_query_pre = SET NAMES utf8
-   sql_query  = SELECT `_id`, `id`, `uid`, `tag` FROM `tag`
-
-   sql_attr_uint = id
-   sql_attr_uint = uid
-
-}
-
-
-source note : base
-{
-   sql_query_pre = SET NAMES utf8
-   sql_query  = SELECT `_id`, `id`, `uid`, `note` FROM `note`
-
-   sql_attr_uint = id
-   sql_attr_uint = uid
-
-}
-
-
-index main1
-{
-	source			= main
-	path			= /var/piler/sphinx/main1
-	docinfo			= extern
-	charset_type		= utf-8
-        enable_star             = 1
-        min_prefix_len          = 6
-        min_word_len            = 1
-
-}
-
-
-index delta1
-{
-        source                  = delta
-        path                    = /var/piler/sphinx/delta1
-        docinfo                 = extern
-        charset_type            = utf-8
-        enable_star             = 1
-        min_prefix_len          = 6
-        min_word_len            = 1
-
-}
-
-
-index tag1
-{
-        source                  = tag
-        path                    = /var/piler/sphinx/tag1
-        docinfo                 = extern
-        charset_type            = utf-8
-        enable_star             = 1
-        min_prefix_len          = 6
-        min_word_len            = 1
-}
-
-
-index note1
-{
-        source                  = note
-        path                    = /var/piler/sphinx/note1
-        docinfo                 = extern
-        charset_type            = utf-8
-        enable_star             = 1
-        min_prefix_len          = 6
-        min_word_len            = 1
-}
-
-
-indexer
-{
-	mem_limit		= 64M
-}
-
-
-searchd
-{
-	listen			= 127.0.0.1:9312
-	listen			= 127.0.0.1:9306:mysql41
-	log			= /dev/null
-	binlog_path             = 
-	##query_log		=
-	read_timeout		= 5
-	max_children		= 30
-	pid_file		= /var/run/piler/searchd.pid
-	max_matches		= 1000
-	seamless_rotate		= 1
-	preopen_indexes		= 1
-	unlink_old		= 1
-	workers			= threads # for RT to work
-	compat_sphinxql_magics  = 0
-}
diff --git a/etc/sphinx.conf.in b/etc/sphinx.conf.in
new file mode 100644
index 0000000..c20248e
--- /dev/null
+++ b/etc/sphinx.conf.in
@@ -0,0 +1,144 @@
+#
+# Minimal Sphinx configuration sample (clean, simple, functional)
+#
+
+source base
+{
+   type = mysql
+   sql_host = MYSQL_HOSTNAME
+   sql_db = MYSQL_DATABASE
+   sql_user = MYSQL_USERNAME
+   sql_pass = MYSQL_PASSWORD
+}
+
+source main : base
+{
+   sql_query_pre = SET NAMES utf8
+   sql_query = SELECT id, `from`, `to`, `fromdomain`, `todomain`, `subject`, `arrived`, `sent`, `body`, `size`, `direction`, `folder`, `attachments`, `attachment_types` FROM sph_index \
+        WHERE id<=( SELECT max_doc_id FROM sph_counter WHERE counter_id=1 )
+
+   sql_attr_uint = size
+   sql_attr_uint = arrived
+   sql_attr_uint = sent
+   sql_attr_uint = direction
+   sql_attr_uint = folder
+   sql_attr_uint = attachments
+
+}
+
+
+source delta : base
+{
+   sql_query_pre = SET NAMES utf8
+   sql_query_pre  = REPLACE INTO sph_counter SELECT 1, MAX(id) FROM sph_index
+   sql_query_post_index  = DELETE FROM sph_index WHERE id<=(SELECT max_doc_id FROM sph_counter WHERE counter_id=1)
+   sql_query = SELECT id, `from`, `to`, `fromdomain`, `todomain`, `subject`, `arrived`, `sent`, `body`, `size`, `direction`, `folder`, `attachments`, `attachment_types` FROM sph_index \
+        WHERE id <= (SELECT max_doc_id FROM sph_counter WHERE counter_id=1)
+
+   sql_attr_uint = size
+   sql_attr_uint = arrived
+   sql_attr_uint = sent
+   sql_attr_uint = direction
+   sql_attr_uint = folder
+   sql_attr_uint = attachments
+
+   sql_query_killlist = SELECT `id` FROM `metadata` WHERE `deleted`=1
+
+}
+
+
+source tag : base
+{
+   sql_query_pre = SET NAMES utf8
+   sql_query  = SELECT `_id`, `id`, `uid`, `tag` FROM `tag`
+
+   sql_attr_uint = id
+   sql_attr_uint = uid
+
+}
+
+
+source note : base
+{
+   sql_query_pre = SET NAMES utf8
+   sql_query  = SELECT `_id`, `id`, `uid`, `note` FROM `note`
+
+   sql_attr_uint = id
+   sql_attr_uint = uid
+
+}
+
+
+index main1
+{
+	source			= main
+	path			= /var/piler/sphinx/main1
+	docinfo			= extern
+	charset_type		= utf-8
+        enable_star             = 1
+        min_prefix_len          = 6
+        min_word_len            = 1
+
+}
+
+
+index delta1
+{
+        source                  = delta
+        path                    = /var/piler/sphinx/delta1
+        docinfo                 = extern
+        charset_type            = utf-8
+        enable_star             = 1
+        min_prefix_len          = 6
+        min_word_len            = 1
+
+}
+
+
+index tag1
+{
+        source                  = tag
+        path                    = /var/piler/sphinx/tag1
+        docinfo                 = extern
+        charset_type            = utf-8
+        enable_star             = 1
+        min_prefix_len          = 6
+        min_word_len            = 1
+}
+
+
+index note1
+{
+        source                  = note
+        path                    = /var/piler/sphinx/note1
+        docinfo                 = extern
+        charset_type            = utf-8
+        enable_star             = 1
+        min_prefix_len          = 6
+        min_word_len            = 1
+}
+
+
+indexer
+{
+	mem_limit		= 64M
+}
+
+
+searchd
+{
+	listen			= 127.0.0.1:9312
+	listen			= 127.0.0.1:9306:mysql41
+	log			= /dev/null
+	binlog_path             = 
+	##query_log		=
+	read_timeout		= 5
+	max_children		= 30
+	pid_file		= /var/run/piler/searchd.pid
+	max_matches		= 1000
+	seamless_rotate		= 1
+	preopen_indexes		= 1
+	unlink_old		= 1
+	workers			= threads # for RT to work
+	compat_sphinxql_magics  = 0
+}
diff --git a/src/config.h b/src/config.h
index 9f0c3f7..fd53513 100644
--- a/src/config.h
+++ b/src/config.h
@@ -13,7 +13,7 @@
 
 #define VERSION "0.1.23-master-branch"
 
-#define BUILD 782
+#define BUILD 783
 
 #define HOSTID "mailarchiver"
 
diff --git a/util/db-mysql-root.sql.in b/util/db-mysql-root.sql.in
new file mode 100644
index 0000000..be73e14
--- /dev/null
+++ b/util/db-mysql-root.sql.in
@@ -0,0 +1,5 @@
+create database MYSQL_DATABASE character set 'utf8';
+grant all privileges on MYSQL_DATABASE.* to MYSQL_USERNAME@localhost identified by 'MYSQL_PASSWORD';
+flush privileges;
+
+
diff --git a/util/db-mysql.sql b/util/db-mysql.sql
index 70c45f2..7b4ad7b 100644
--- a/util/db-mysql.sql
+++ b/util/db-mysql.sql
@@ -1,6 +1,3 @@
-create database if not exists `piler` character set 'utf8';
-use `piler`;
-
 
 drop table if exists `sph_counter`;
 create table if not exists `sph_counter` (
diff --git a/util/postinstall.sh b/util/postinstall.sh
new file mode 100755
index 0000000..43a4071
--- /dev/null
+++ b/util/postinstall.sh
@@ -0,0 +1,283 @@
+#!/bin/sh
+
+
+INDEXER=`which indexer 2>/dev/null`
+SEARCHD=`which searchd 2>/dev/null`
+CRON_ORIG="/tmp/crontab.piler.orig"
+CRON_TMP="/tmp/crontab.piler"
+
+
+. ./util/utilfunc.sh
+
+
+preinstall_check() {
+   check_user root
+
+   if [ "x$INDEXER" = "x" ]; then "ERROR: cannot find sphinx indexer"; echo ""; exit ; fi
+
+   if [ "x$SEARCHD" = "x" ]; then "ERROR: cannot find sphinx searchd"; echo ""; exit 0; fi
+
+   if [ -f $KEYFILE ]; then echo "ERROR: found existing keyfile ($KEYFILE), aborting install"; echo ""; exit 0; fi
+}
+
+
+gather_webserver_data() {
+   askNonBlank "Please enter the path of your documentroot" "$DOCROOT"
+   DOCROOT=$response
+
+   if [ -d $DOCROOT ]; then echo "ERROR: vhost docroot should NOT exist, abroting install"; echo ""; exit 0; fi
+
+   askNonBlank "Please enter the webserver groupname" "$WWWGROUP"
+   WWWGROUP=$response
+}
+
+
+gather_mysql_account() {
+
+   askNonBlank "Please enter mysql hostname" "$MYSQL_HOSTNAME"
+   MYSQL_HOSTNAME=$response
+
+   askNonBlank "Please enter mysql database" "$MYSQL_DATABASE"
+   MYSQL_DATABASE=$response
+
+   askNonBlank "Please enter mysql user name" "$MYSQL_USERNAME"
+   MYSQL_USERNAME=$response
+
+   askNonBlankNoEcho "Please enter mysql password for $MYSQL_USERNAME" ""
+   MYSQL_PASSWORD=$response
+
+   askNonBlankNoEcho "Please enter mysql root password" ""
+   MYSQL_ROOT_PASSWORD=$response
+
+   s=`echo "use information_schema; select TABLE_NAME from TABLES where TABLE_SCHEMA='$MYSQL_DATABASE'" | mysql -h $MYSQL_HOSTNAME -u root --password=$MYSQL_ROOT_PASSWORD`
+   if [ $? -eq 0 ];
+   then
+      echo "mysql connection successful"; echo;
+      if [ `echo $s | grep -c metadata` -eq 1 ]; then echo "ERROR: Detected metadata table in $MYSQL_DATABASE. Aborting"; exit 0; fi
+   else
+      echo "ERROR: failed to connect to mysql";
+      gather_mysql_account
+   fi
+
+}
+
+
+gather_sphinx_data() {
+
+   if [ $INDEXER = "/usr/bin/indexer" ]; then SPHINXCFG="/etc/sphinx.conf"; fi
+
+   askNonBlank "Please enter the path of sphinx.conf" "$SPHINXCFG"
+   SPHINXCFG=$response
+}
+
+
+gather_smtp_relay_data() {
+   ask "Please enter smtp relay" "$SMARTHOST"
+   SMARTHOST=$response
+
+   askNonBlankNoEcho "Please enter smtp relay port" "$SMARTHOST_PORT"
+   SMARTHOST_PORT=$response
+}
+
+
+make_cron_entries() {
+
+   crontab -u $PILERUSER -l > $CRON_ORIG
+
+   grep PILERSTART $CRON_ORIG > /dev/null 2>&1
+   if [ $? != 0 ]; then
+      cat /dev/null > $CRON_ORIG
+   fi
+
+   grep PILEREND $CRON_ORIG > /dev/null 2>&1
+   if [ $? != 0 ]; then
+      cat /dev/null > $CRON_ORIG
+   fi
+
+
+   rm -f $CRON_TMP
+
+   echo ""
+   echo "### PILERSTART" >> $CRON_TMP
+   echo "*/5 * * * * LC_ALL=C mpstat | tail -1 | awk '{print $11}' > $LOCALSTATEDIR/piler/stat/cpu.stat" >> $CRON_TMP
+   echo "5,35 * * * * $INDEXER --quiet delta1 --rotate && sleep 2 && $INDEXER --quiet --merge main1 delta1 --merge-dst-range deleted 0 0 --rotate" >> $CRON_TMP
+   echo "*/15 * * * * $INDEXER --quiet tag1 --rotate" >> $CRON_TMP
+   echo "*/15 * * * * $INDEXER --quiet note1 --rotate" >> $CRON_TMP
+   echo "### PILEREND" >> $CRON_TMP
+}
+
+
+make_new_key() {
+   dd if=/dev/urandom bs=56 count=1 of=$KEYTMPFILE 2>/dev/null
+
+   if [ `stat -c '%s' $KEYTMPFILE` -ne 56 ]; then echo "could not read 56 bytes from /dev/urandom to $KEYTMPFILE"; exit 1; fi
+}
+
+
+show_summary() {
+   echo
+   echo
+   echo "INSTALLATION SUMMARY:"
+   echo
+
+   echo "piler user: $PILERUSER"
+   echo "keyfile: $KEYFILE"
+   echo
+
+   echo "mysql host: $MYSQL_HOSTNAME"
+   echo "mysql database: $MYSQL_DATABASE"
+   echo "mysql username: $MYSQL_USERNAME"
+   echo "mysql password: *******"
+   echo
+
+   echo "sphinx indexer: $INDEXER"
+   echo "sphinx config file: $SPHINXCFG"
+   echo
+
+   echo "vhost docroot: $DOCROOT"
+   echo "www group: $WWWGROUP"
+   echo
+
+   echo "smtp relay host: $SMARTHOST"
+   echo "smtp relay port: $SMARTHOST_PORT"
+   echo
+
+   echo "piler crontab:"
+   cat $CRON_TMP
+   echo; echo;
+
+   askYN "Correct? [Y/N]" "N"
+   if [ $response != "yes" ]; then
+      echo "Aborted."
+      exit
+   fi
+
+}
+
+
+execute_post_install_tasks() {
+
+   askYN "Continue and modify system? [Y/N]" "N"
+   if [ $response != "yes" ]; then
+      echo "Aborted."
+      exit
+   fi
+
+   echo;
+   echo -n "Creating mysql database... ";
+   sed -e "s%MYSQL_HOSTNAME%$MYSQL_HOSTNAMEg%" -e "s%MYSQL_DATABASE%$MYSQL_DATABASE%g" -e "s%MYSQL_USERNAME%$MYSQL_USERNAME%g" -e "s%MYSQL_PASSWORD%$MYSQL_PASSWORD%g" util/db-mysql-root.sql.in | mysql -h $MYSQL_HOSTNAME -u root --password=$MYSQL_ROOT_PASSWORD
+   mysql -h $MYSQL_HOSTNAME -u $MYSQL_USERNAME --password=$MYSQL_PASSWORD $MYSQL_DATABASE < util/db-mysql.sql
+   echo "Done."
+
+   echo -n "Overwriting sphinx configuration... ";
+   sed -e "s%MYSQL_HOSTNAME%$MYSQL_HOSTNAME%" -e "s%MYSQL_DATABASE%$MYSQL_DATABASE%" -e "s%MYSQL_USERNAME%$MYSQL_USERNAME%" -e "s%MYSQL_PASSWORD%$MYSQL_PASSWORD%" etc/sphinx.conf.in > etc/sphinx.conf
+   cp etc/sphinx.conf $SPHINXCFG
+   echo "Done."
+
+   echo -n "Initializing sphinx indices... ";
+   su $PILERUSER -c "indexer --all"
+   echo "Done."
+
+
+   echo -n "installing cron entries for $PILERUSER... "
+   crontab -u $PILERUSER $CRON_TMP
+   echo "Done."
+
+
+   echo -n "installing keyfile ($KEYTMPFILE) to $KEYFILE... "
+   cp $KEYTMPFILE $KEYFILE
+   chgrp $PILERUSER $KEYFILE
+   chmod 640 $KEYFILE
+   rm -f $KEYTMPFILE
+   echo "Done."
+
+   echo -n "Copying www files to $DOCROOT... "
+   mkdir -p $DOCROOT || exit 1
+
+   cp -R webui/* $DOCROOT
+   cp -R webui/.htaccess $DOCROOT
+   chmod 770 $DOCROOT/tmp
+   chgrp $WWWGROUP $DOCROOT/tmp
+
+   echo "<?php" > $DOCROOT/config-site.php
+   echo >> $DOCROOT/config-site.php
+
+   echo "\$config['SITE_NAME'] = '$HOSTNAME';" >> $DOCROOT/config-site.php
+   echo "\$config['SITE_URL'] = 'http://$HOSTNAME/';" >> $DOCROOT/config-site.php
+   echo "\$config['DIR_BASE'] = '$DOCROOT/';" >> $DOCROOT/config-site.php
+
+   echo >> $DOCROOT/config-site.php
+
+   echo "\$config['ENABLE_SYSLOG'] = 1;" >> $DOCROOT/config-site.php
+
+   echo >> $DOCROOT/config-site.php
+
+   echo "\$config['SMTP_DOMAIN'] = '$HOSTNAME';" >> $DOCROOT/config-site.php
+   echo "\$config['SMTP_FROMADDR'] = 'no-reply@$HOSTNAME';" >> $DOCROOT/config-site.php
+   echo "\$config['ADMIN_EMAIL'] = 'admin@$HOSTNAME';" >> $DOCROOT/config-site.php
+
+   echo >> $DOCROOT/config-site.php
+
+   echo "\$config['DB_DRIVER'] = 'mysql';" >> $DOCROOT/config-site.php
+   echo "\$config['DB_PREFIX'] = '';" >> $DOCROOT/config-site.php
+   echo "\$config['DB_HOSTNAME'] = '$MYSQL_HOSTNAME';" >> $DOCROOT/config-site.php
+   echo "\$config['DB_USERNAME'] = '$MYSQL_USERNAME';" >> $DOCROOT/config-site.php
+   echo "\$config['DB_PASSWORD'] = '$MYSQL_PASSWORD';" >> $DOCROOT/config-site.php
+   echo "\$config['DB_DATABASE'] = '$MYSQL_DATABASE';" >> $DOCROOT/config-site.php
+
+   echo >> $DOCROOT/config-site.php
+
+   echo "\$config['SMARTHOST'] = '$SMARTHOST';" >> $DOCROOT/config-site.php
+   echo "\$config['SMARTHOST_PORT'] = $SMARTHOST_PORT;" >> $DOCROOT/config-site.php
+
+   echo >> $DOCROOT/config-site.php
+
+   echo "?>" >> $DOCROOT/config-site.php
+
+   echo "Done."
+
+}
+
+
+clean_up_temp_stuff() {
+   rm -f $CRON_TMP
+
+   echo; echo "Done post installation tasks."; echo
+}
+
+
+load_default_values
+
+
+if [ $# -ne 4 ]; then usage; fi
+
+PILERUSER=$1
+PILERGROUP=$2
+SYSCONFDIR=$3
+LOCALSTATEDIR=$4
+
+
+#LOGFILE="/tmp/piler-install.log.$$"
+#touch $LOGFILE
+#chmod 600 $LOGFILE
+
+preinstall_check
+
+display_install_intro
+
+gather_webserver_data
+gather_mysql_account
+gather_sphinx_data
+gather_smtp_relay_data
+
+
+make_cron_entries
+make_new_key
+
+show_summary
+
+execute_post_install_tasks
+
+clean_up_temp_stuff
+
+
diff --git a/util/utilfunc.sh b/util/utilfunc.sh
new file mode 100644
index 0000000..7236ffd
--- /dev/null
+++ b/util/utilfunc.sh
@@ -0,0 +1,154 @@
+#!/bin/sh
+
+
+usage() {
+   echo "usage: $0 <username> <group> <sysconfdir> <localstatedir>";
+   exit 1;
+}
+
+
+load_default_values() {
+   PILERUSER="piler"
+   SYSCONFDIR="/usr/local/etc"
+   LOCALSTATEDIR="/var"
+
+   KEYTMPFILE="piler.key"
+   KEYFILE="$SYSCONFDIR/piler.key"
+
+   HOSTNAME=`hostname --fqdn`
+
+   MYSQL_HOSTNAME="localhost"
+   MYSQL_DATABASE="piler"
+   MYSQL_USERNAME="piler"
+   MYSQL_PASSWORD=""
+   MYSQL_ROOT_PASSWORD=""
+
+   SPHINXCFG="/usr/local/etc/sphinx.conf"
+
+   WWWGROUP="apache"
+   DOCROOT="/var/www/$HOSTNAME"
+
+   SMARTHOST=""
+   SMARTHOST_PORT=25
+}
+
+
+display_install_intro() {
+  echo ""
+  echo ""
+  echo "This is the postinstall utility for piler"
+  echo "It should be run only at the first install. DO NOT run on an existing piler installation!"
+  echo ""
+
+  askYN "Continue? [Y/N]" "N"
+  if [ $response != "yes" ]; then
+     echo "Aborted."
+     exit
+  fi
+
+  echo ""
+}
+
+
+check_user() {
+   user=$1
+
+   if [ x`whoami` != x$user ]; then echo "ERROR: postinstaller must be run as $user user"; exit 1; fi
+}
+
+
+isFQDN() {
+  # we need min. 2 dots
+  if [ x"$1" = "xdogfood" ]; then
+    echo 1
+    return
+  fi
+
+  if [ x"$1" = "x" ]; then
+    echo 0
+    return
+  fi
+
+  NF=`echo $1 | awk -F. '{print NF}'`
+  if [ $NF -ge 2 ]; then 
+    echo 1
+  else 
+    echo 0
+  fi
+}
+
+
+ask() {
+  PROMPT=$1
+  DEFAULT=$2
+
+  echo ""
+  echo -n "$PROMPT [$DEFAULT] "
+  read response
+
+  if [ -z $response ]; then
+    response=$DEFAULT
+  fi
+}
+
+
+askNonBlankNoEcho() {
+  PROMPT=$1
+  DEFAULT=$2
+
+  while [ 1 ]; do
+    stty -echo
+    ask "$PROMPT" "$DEFAULT"
+    stty echo
+    echo ""
+    if [ ! -z $response ]; then
+      break
+    fi
+    echo "A non-blank answer is required"
+  done
+}
+
+askNonBlank() {
+  PROMPT=$1
+  DEFAULT=$2
+
+  while [ 1 ]; do
+    ask "$PROMPT" "$DEFAULT"
+    if [ ! -z $response ]; then
+      break
+    fi
+    echo "A non-blank answer is required"
+  done
+}
+
+askYN() {
+  PROMPT=$1
+  DEFAULT=$2
+
+  if [ "x$DEFAULT" = "xyes" -o "x$DEFAULT" = "xYes" -o "x$DEFAULT" = "xy" -o "x$DEFAULT" = "xY" ]; then
+    DEFAULT="Y"
+  else
+    DEFAULT="N"
+  fi
+  
+  while [ 1 ]; do
+    ask "$PROMPT" "$DEFAULT"
+    response=$(perl -e "print lc(\"$response\");")
+    if [ -z $response ]; then
+      :
+    else
+      if [ $response = "yes" -o $response = "y" ]; then
+        response="yes"
+        break
+      else 
+        if [ $response = "no" -o $response = "n" ]; then
+          response="no"
+          break
+        fi
+      fi
+    fi
+    echo "A Yes/No answer is required"
+  done
+}
+
+