diff --git a/libisoburn/trunk/releng/releng_build_jigdo b/libisoburn/trunk/releng/releng_build_jigdo
index 957ebc68..dcf67b11 100755
--- a/libisoburn/trunk/releng/releng_build_jigdo
+++ b/libisoburn/trunk/releng/releng_build_jigdo
@@ -2,16 +2,60 @@
 
 set -e
 
-if [ ! "${3}" ]; then 
- printf "$0 xorriso_cmd dir_in image_out [--clean]\n"
- exit 1;
+# required
+XOR=""
+DIR=""
+IMG=""
+# optional
+ISOLINUX_BIN=""
+BOOT_CAT=""
+CONFFILE=$HOME/releng_build_jigdo.conf
+CLEAN=0
+
+print_help() {
+ cat << HLP
+Usage:
+ $0 -help
+# using a config file ${CONFFILE}
+ $0 -rc [-clean]
+ config file content:
+ XOR=/path/to/xorriso
+ DIR=/path/to/input_dir
+ IMG=/path/to/out_image
+ ISOLINUX_BIN=/path/to/isolinux.bin
+ BOOT_CAT=/path/to/boot.cat
+# without using a config file
+ $0 xorriso_cmd IN_dir OUT_image [IN_isolinux] [IN_bootcat] [-clean]
+HLP
+}
+
+# help
+if [ ! "${1}" -o "${1}" == "-help" ]; then print_help && exit 0; fi
+# config file
+if [ "${1}" == "-rc" ]; then
+ if [ -e ${CONFFILE} ]; then . ${CONFFILE}
+ else echo -e "$0: can not find config file: ${CONFFILE}\n"
+ fi
+ if [ "${2}" == "-clean" ]; then CLEAN=1; fi
+# command line args
+elif [ "${3}" ]; then
+ XOR="${1}"
+ DIR="${2}"
+ IMG="${3}"
+ if [ "{4}" ]; then
+  ISOLINUX_BIN="${4}"
+  if [ "{5}" ]; then BOOT_CAT="${5}"; fi
+  if [ "${4}" == "-clean" -o "${5}" == "-clean" -o "${6}" == "-clean" ]; then CLEAN=1; fi
+ fi
+# the rest
+else
+ print_help && exit 0
 fi
 
-XOR=${1}
-DIR=${2}
-IMG=${3}
 RES="${IMG}.iso ${IMG}.new ${IMG}.md5 ${IMG}.jigdo ${IMG}.template"
 
+############################################################
+main() {
 # remove cruft from previous runs
 # rm -f ${RES}
 
@@ -33,7 +77,7 @@ CMD="${XOR} \
  -partition_offset 16 \
  -J -joliet-long \
 "
-# boot section
+# boot section TODO
 #if [ "${5}" -a "${6}" ]; then
 #CMD+=\
 # -b boot/isolinux/isolinux.bin \                     # $5
@@ -73,9 +117,13 @@ jigit-mkimage \
 diff ${IMG}.iso ${IMG}.new
 
 # sort out the cruft
-if [ "${4}" == "--clean" ]; then
+if [ ${CLEAN} -eq 1 ]; then
  rm -f ${RES}
  printf "removed: %s\n" ${RES}
 else
  printf "left: %s\n" ${RES}
 fi
+}
+
+#
+main