diff --git a/releng/releng_build_isojigdo b/releng/releng_build_isojigdo
index c4d7f8f3..d15b94e0 100755
--- a/releng/releng_build_isojigdo
+++ b/releng/releng_build_isojigdo
@@ -5,12 +5,12 @@ set -e
 START_DIR_DONT_CHANGE=`pwd`
 SELF=$(basename "$0")
 # required config items
-XOR=""
-DIR=""
-IMG=""
+RELENG_XORRISO=""
+RELENG_DIR=""
+RELENG_IMG=""
 # optional config items
-ISOLINUX_BIN=""
-BOOT_CAT=""
+RELENG_ISOLINUX_BIN=""
+RELENG_BOOT_CAT=""
 CONFFILE=$HOME/.libburnia-releng/releng_build_isojigdo.conf
 KEEP=0
 GEN_DATA_DIR=releng_generated_data/${SELF}
@@ -58,12 +58,12 @@ if [ "${1}" == "-rc" ]; then
  if [ "${2}" == "-keep" ]; then KEEP=1; fi
 # command line args
 elif [ "${3}" ]; then
- XOR="${1}"
- DIR="${2}"
- IMG="${3}"
+ RELENG_XORRISO="${1}"
+ RELENG_DIR="${2}"
+ RELENG_IMG="${3}"
  if [ "${4}" ]; then
-  ISOLINUX_BIN="${4}"
-  if [ "${5}" ]; then BOOT_CAT="${5}"; fi
+  RELENG_ISOLINUX_BIN="${4}"
+  if [ "${5}" ]; then RELENG_BOOT_CAT="${5}"; fi
   if [ "${4}" == "-keep" -o "${5}" == "-keep" -o "${6}" == "-keep" ]; then KEEP=1; fi
  fi
 # the rest
@@ -80,25 +80,25 @@ else
  mkdir "${GEN_DATA_DIR}"
 fi
 
-if [ "${XOR}" == "" -o "${DIR}" == "" -o "${IMG}" == "" ]; then
+if [ "${RELENG_XORRISO}" == "" -o "${RELENG_DIR}" == "" -o "${RELENG_IMG}" == "" ]; then
  echo -e "\n${SELF}: xorriso_cmd IN_dir and OUT_image are required\n"
  exit 40
 fi
 
-if [ ! -x "${XOR}" ]; then
- printf "${SELF}: Not found or not an executable: $XOR\n"
+if [ ! -x "${RELENG_XORRISO}" ]; then
+ printf "${SELF}: Not found or not an executable: $RELENG_XORRISO\n"
  exit 50
 fi
 
 # all must be set at this point
 printf "${SELF}: Config items:"
-printf "\n\txorriso_cmd=${XOR}\n\tIN_dir=${DIR}\n\tOUT_image=${IMG}.iso"
-printf "\n\tIN_isolinux=${ISOLINUX_BIN}\n\tOUT_bootcat=${BOOT_CAT}\n"
-RES="${IMG}.iso ${IMG}.new ${IMG}.md5 ${IMG}.jigdo ${IMG}.template"
+printf "\n\txorriso_cmd=${RELENG_XORRISO}\n\tIN_dir=${RELENG_DIR}\n\tOUT_image=${RELENG_IMG}.iso"
+printf "\n\tIN_isolinux=${RELENG_ISOLINUX_BIN}\n\tOUT_bootcat=${RELENG_BOOT_CAT}\n"
+RES="${RELENG_IMG}.iso ${RELENG_IMG}.new ${RELENG_IMG}.md5 ${RELENG_IMG}.jigdo ${RELENG_IMG}.template"
 
 # xorriso version details, incl. underlying libraries
-"${XOR}" -version
-if ! "${XOR}" -version | grep libjte >/dev/null 2>&1; then
+"${RELENG_XORRISO}" -version
+if ! "${RELENG_XORRISO}" -version | grep libjte >/dev/null 2>&1; then
  printf "\n${SELF}: JTE not supported with this xorriso build. Install jigit and rebuild."
  printf "\n${SELF}: See http://www.einval.com/~steve/software/JTE/\n"
  exit 51
@@ -116,7 +116,7 @@ fi
 # create MD5 list in base64 format
 if which jigdo-gen-md5-list >/dev/null 2>&1; then
  printf "${SELF}: Creating MD5 list in hex format..."
- jigdo-gen-md5-list ${DIR} > ${GEN_DATA_DIR}/${IMG}.md5
+ jigdo-gen-md5-list ${RELENG_DIR} > ${GEN_DATA_DIR}/${RELENG_IMG}.md5
  printf "Done.\n"
 else
  printf "\n${SELF}: Not found: jigdo-gen-md5-list. Install jigit."
@@ -125,10 +125,10 @@ else
 fi
 
 # build the command - general section
-CMD="${XOR} \
+CMD="${RELENG_XORRISO} \
  -as mkisofs \
  -quiet \
- -o ${GEN_DATA_DIR}/${IMG}.iso \
+ -o ${GEN_DATA_DIR}/${RELENG_IMG}.iso \
  -R \
  -V ISOJIGDO \
  -partition_offset 16 \
@@ -136,10 +136,10 @@ CMD="${XOR} \
 "
 
 # boot section TODO
-#if [ "${ISOLINUX_BIN}" -a "${BOOT_CAT}" ]; then
+#if [ "${RELENG_ISOLINUX_BIN}" -a "${RELENG_BOOT_CAT}" ]; then
 #CMD+=\
-# -b ${ISOLINUX_BIN} \                                # NOTE: boot/isolinux/isolinux.bin
-# -c ${BOOT_CAT} \                                    # NOTE: boot/boot.cat
+# -b ${RELENG_ISOLINUX_BIN} \                         # NOTE: boot/isolinux/isolinux.bin
+# -c ${RELENG_BOOT_CAT} \                             # NOTE: boot/boot.cat
 # -no-emul-boot -boot-load-size 4 -boot-info-table \
 # -isohybrid-mbr somembr.sysarea \                    # TODO: figure out where to grab one
 # -partition_offset 16 \
@@ -151,14 +151,14 @@ CMD+="\
  -jigdo-template-compress gzip \
  -checksum_algorithm_iso md5,sha1,sha256,sha512 \
  -checksum_algorithm_template md5,sha1,sha256,sha512 \
- -jigdo-jigdo ${GEN_DATA_DIR}/${IMG}.jigdo \
- -jigdo-template ${GEN_DATA_DIR}/${IMG}.template \
- -jigdo-map Debian=${DIR} \
- -md5-list  ${GEN_DATA_DIR}/${IMG}.md5 \
+ -jigdo-jigdo ${GEN_DATA_DIR}/${RELENG_IMG}.jigdo \
+ -jigdo-template ${GEN_DATA_DIR}/${RELENG_IMG}.template \
+ -jigdo-map Debian=${RELENG_DIR} \
+ -md5-list  ${GEN_DATA_DIR}/${RELENG_IMG}.md5 \
  -jigdo-min-file-size 1024 \
 "
 
-CMD+="${DIR}"
+CMD+="${RELENG_DIR}"
 
 # run it
 echo -e "${SELF}: Creating ISO and jigdo representations:\n$CMD\n"
@@ -168,10 +168,10 @@ ${CMD}
 if which jigit-mkimage >/dev/null 2>&1; then
  printf "${SELF}: Creating new ISO from jigdo files..."
  jigit-mkimage \
-  -t ${GEN_DATA_DIR}/${IMG}.template \
-  -j ${GEN_DATA_DIR}/${IMG}.jigdo \
-  -m Debian=${DIR} \
-  -o ${GEN_DATA_DIR}/${IMG}.new
+  -t ${GEN_DATA_DIR}/${RELENG_IMG}.template \
+  -j ${GEN_DATA_DIR}/${RELENG_IMG}.jigdo \
+  -m Debian=${RELENG_DIR} \
+  -o ${GEN_DATA_DIR}/${RELENG_IMG}.new
  printf "Done.\n"
 else
  printf "\n${SELF}: Not found: jigit-mkimage. Install jigit."
@@ -180,11 +180,11 @@ else
 fi
 
 # trap the exit code of diff and let the Universe explode
-diff ${GEN_DATA_DIR}/${IMG}.iso ${GEN_DATA_DIR}/${IMG}.new
+diff ${GEN_DATA_DIR}/${RELENG_IMG}.iso ${GEN_DATA_DIR}/${RELENG_IMG}.new
 DIFF_RET="$?"
 case ${DIFF_RET} in
      0)
-      echo -e "${SELF}: diff ${GEN_DATA_DIR}/${IMG}.iso ${GEN_DATA_DIR}/${IMG}.new matched.\n"
+      echo -e "${SELF}: diff ${GEN_DATA_DIR}/${RELENG_IMG}.iso ${GEN_DATA_DIR}/${RELENG_IMG}.new matched.\n"
      ;;
      *)
       echo -e "${SELF}: FAIL: diff returned code: $DIFF_RET\n"
@@ -204,9 +204,9 @@ fi
 
 # last hints
 printf "\n${SELF}: HINT: manual checks remained to be done:\n"
-printf " * ${IMG}.img boots from USB stick and/or optical media.\n"
+printf " * ${RELENG_IMG}.img boots from USB stick and/or optical media.\n"
 printf " * appended FAT partition is mountable.\n"
-printf " * xorriso -indev ${IMG}.iso -pvd_info\n"
-printf " * fdisk -lu ${IMG}.iso\n"
+printf " * xorriso -indev ${RELENG_IMG}.iso -pvd_info\n"
+printf " * fdisk -lu ${RELENG_IMG}.iso\n"
 
 exit 0
diff --git a/releng/releng_build_isojigdo.conf.template b/releng/releng_build_isojigdo.conf.template
index 781d992c..5f22fc69 100644
--- a/releng/releng_build_isojigdo.conf.template
+++ b/releng/releng_build_isojigdo.conf.template
@@ -3,16 +3,16 @@
 # *** Then a run of 'releng_build_isojigdo -rc' will pick it up
 
 # xorriso executable to be tested
-XOR=/path/to/xorriso
+RELENG_XORRISO=/path/to/xorriso
 
 # Should contain an ISOLINUX setup and some payload files
-DIR=/path/to/input_dir
+RELENG_DIR=/path/to/input_dir
 
 # Gets created resp. overwritten by this test
-IMG=/path/to/out_image
+RELENG_IMG=/path/to/out_image
 
 # It is part of the ISOLINUX setup in $DIR
-ISOLINUX_BIN=/path/to/input_dir/isolinux.bin
+RELENG_ISOLINUX_BIN=/path/to/input_dir/isolinux.bin
 
 # Will be created in the ISO image. Should not exist in $DIR
-BOOT_CAT=/path/to/boot.cat
+RELENG_BOOT_CAT=/path/to/boot.cat