function linkup() {
	local component=$1
	shift
	#do core
	for rk in $*; do
		if [ ! -e "../$rk/$component" ]; then
			ln -s "../shared/$component" "../$rk"
		fi
	done
}

#check they all exist first
for rk in lirk2 wirk2 mark2 rk3 sork2 sork3 derk cdrk2; do
	if [ ! -d "../$rk" ]; then
		echo "$rk not present"
		some_not_present=true
	fi
done
if [ "$some_not_present" == "true" ]; then
	exit
fi

linkup core rk3 lirk2 wirk2 mark2 sork2 sork3 derk cdrk2
linkup greenstone2 lirk2 wirk2 mark2 sork2 cdrk2
linkup greenstone3 rk3 sork3
linkup linux rk3 lirk2 mark2 sork2 sork3 derk cdrk2
linkup windows rk3 wirk2 sork2 sork3 cdrk2
linkup mac rk3 mark2