# for distros that do not define bootstrapfs variants
shopt -s nullglob
-for pkgs in ../build/config.${pldistro}/bootstrapfs-*.pkgs ; do
+pkgs_count=(ls ../build/config.${pldistro}/bootstrapfs-*.pkgs 2> /dev/null | wc -l)
+[ $pkgs_count -gt 0 ] && for pkgs in $(ls ../build/config.${pldistro}/bootstrapfs-*.pkgs); do
NAME=$(basename $pkgs .pkgs | sed -e s,bootstrapfs-,,)
echo "--------START BUILDING PlanetLab-Bootstrap-${NAME}: $(date)"