diff --git a/compile.sh b/compile.sh
index d3f80d0..7a53b15 100755
--- a/compile.sh
+++ b/compile.sh
@@ -8,6 +8,10 @@
 #
 # This file is a part of tool chain https://github.com/igorpecovnik/lib
 #
+# command line parameter 1 (optional):
+#	source a script named "config-$1.conf" just before self-update
+#	of Armbian to override parameters defined below
+#
 #--------------------------------------------------------------------------------------------------------------------------------
 
 # Read build script documentation
@@ -15,26 +19,26 @@
 # for detailed explanation of these parameters
 
 # method
-KERNEL_ONLY=""						# leave empty to select each time, set to "yes" or "no" to skip dialog prompt
-KERNEL_CONFIGURE="no"					# want to change my default configuration
-CLEAN_LEVEL="make,debs"					# comma-separated list of clean targets: "make" = make clean for selected kernel and u-boot,
+: ${KERNEL_ONLY:=""}					# leave empty to select each time, set to "yes" or "no" to skip dialog prompt
+: ${KERNEL_CONFIGURE:="no"}				# want to change my default configuration
+: ${CLEAN_LEVEL:="make,debs"}				# comma-separated list of clean targets: "make" = make clean for selected kernel and u-boot,
 							# "debs" = delete packages in "./output/debs" for current branch and family,
 							# "alldebs" - delete all packages in "./output/debs", "images" = delete "./output/images",
 							# "cache" = delete "./output/cache", "sources" = delete "./sources"
 # user
-DEST_LANG="en_US.UTF-8"					# sl_SI.UTF-8, en_US.UTF-8
-CONSOLE_CHAR="UTF-8"
+: ${DEST_LANG:="en_US.UTF-8"}				# sl_SI.UTF-8, en_US.UTF-8
+: ${CONSOLE_CHAR:="UTF-8"}
 
 # advanced
-KERNEL_KEEP_CONFIG="no"					# overwrite kernel config before compilation
-EXTERNAL="yes"						# build and install extra applications and drivers
-DEBUG_MODE="no"					# wait that you make changes to uboot and kernel source and creates patches
-FORCE_CHECKOUT="yes"					# ignore manual changes to source
-BUILD_ALL="no"						# cycle through available boards and make images or kernel/u-boot packages.
+: ${KERNEL_KEEP_CONFIG:="no"}				# overwrite kernel config before compilation
+: ${EXTERNAL:="yes"}					# build and install extra applications and drivers
+: ${DEBUG_MODE:="no"}					# wait that you make changes to uboot and kernel source and creates patches
+: ${FORCE_CHECKOUT:="yes"}				# ignore manual changes to source
+: ${BUILD_ALL:="no"}					# cycle through available boards and make images or kernel/u-boot packages.
 							# set KERNEL_ONLY to "yes" or "no" to build all kernels/all images
 
 # build script version to use
-LIB_TAG=""						# empty for latest version,
+: ${LIB_TAG:=""}					# empty for latest version,
 							# one of listed here: https://github.com/igorpecovnik/lib/tags for stable versions,
 							# or commit hash
 #--------------------------------------------------------------------------------------------------------------------------------
@@ -46,26 +50,38 @@ DEST=$SRC/output
 # sources for compilation
 SOURCES=$SRC/sources
 
+# for output coloring
+: ${COL_ERROR:="\e[0;31m"}	# red
+: ${COL_INFO:="\e[0;32m"}	# green
+: ${COL_MARKED:="\e[0;33m"}	# yellow
+: ${COL_WARN:="\e[0;35m"}	# magenta
+: ${COL_OFF:="\x1B[0m"}
+
 #--------------------------------------------------------------------------------------------------------------------------------
-# To preserve proper librarires updating
+# To preserve proper libraries updating
 #--------------------------------------------------------------------------------------------------------------------------------
 if [[ -f $SRC/main.sh && -d $SRC/bin ]]; then
-	echo -e "[\e[0;31m error \x1B[0m] Copy this file one level up, alter and run again."
+	echo -e "[${COL_ERROR} error ${COL_OFF}] Copy this file one level up, alter and run again."
 	exit
 fi
 
+#--------------------------------------------------------------------------------------------------------------------------------
+# include user defined variable overrides
+#--------------------------------------------------------------------------------------------------------------------------------
+
+[[ -n $1 && -f $SRC/config-$1.conf ]] && source $SRC/config-$1.conf
 
 #--------------------------------------------------------------------------------------------------------------------------------
 # Show warning for those who updated the script
 #--------------------------------------------------------------------------------------------------------------------------------
 if [[ -d $DEST/output ]]; then
-	echo -e "[\e[0;35m warn \x1B[0m] Structure has been changed. Remove all files and start in a clean directory. \
+	echo -e "[${COL_WARN} warn ${COL_OFF}] Structure has been changed. Remove all files and start in a clean directory. \
 	CTRL-C to exit or any key to continue. Only sources will be doubled ..."
 	read
 fi
 
 if [[ $EUID != 0 ]]; then
-	echo -e "[\e[0;35m warn \x1B[0m] This script requires root privileges"
+	echo -e "[${COL_WARN} warn ${COL_OFF}] This script requires root privileges"
 	sudo "$0" "$@"
 	exit 1
 fi
@@ -81,17 +97,18 @@ if [[ ! -d $SRC/lib ]]; then
 fi
 cd $SRC/lib
 if [[ ! -f $SRC/.ignore_changes ]]; then
-	echo -e "[\e[0;32m o.k. \x1B[0m] This script will try to update"
+	echo -e "[${COL_INFO} o.k. ${COL_OFF}] This script will try to update"
 	git pull
 	CHANGED_FILES=$(git diff --name-only)
 	if [[ -n $CHANGED_FILES ]]; then
-		echo -e "[\e[0;35m warn \x1B[0m] Can't update [\e[0;33mlib/\x1B[0m] since you made changes to: \e[0;32m\n${CHANGED_FILES}\x1B[0m"
-		echo -e "Press \e[0;33m<Ctrl-C>\x1B[0m to abort compilation, \e[0;33m<Enter>\x1B[0m to ignore and continue"
+		echo -e "[${COL_WARN} warn ${COL_OFF}] Can't update [${COL_MARKED}lib/${COL_OFF}] since you made changes to: ${COL_INFO}\n${CHANGED_FILES}${COL_OFF}"
+		echo -e "Press ${COL_MARKED}<Ctrl-C>${COL_OFF} to abort compilation, ${COL_MARKED}<Enter>${COL_OFF} to ignore and continue"
 		read
 	else
 		git checkout ${LIB_TAG:- master}
 	fi
 fi
+
 #--------------------------------------------------------------------------------------------------------------------------------
 # Do we need to build all images
 #--------------------------------------------------------------------------------------------------------------------------------
@@ -101,6 +118,9 @@ else
 	source $SRC/lib/main.sh
 fi
 
+# make current user owner of all files (instead of root)
+[[ ! -z $SUDO_USER ]] && chown -R $SUDO_USER:$SUDO_USER $SRC
+
 # If you are committing new version of this file, increment VERSION
 # Only integers are supported
-# VERSION=19
+# VERSION=20