-arvados_cwl_runner_version=$(awk '($1 == "Version:"){print $2}' $WORKSPACE/sdk/cwl/arvados_cwl_runner.egg-info/PKG-INFO)
-arvados_cwl_runner_iteration=3
+arvados_cwl_runner_version=${ARVADOS_BUILDING_VERSION:-$(awk '($1 == "Version:"){print $2}' $WORKSPACE/sdk/cwl/arvados_cwl_runner.egg-info/PKG-INFO)}
+declare -a iterargs=()
+if [[ -z "$ARVADOS_BUILDING_VERSION" ]]; then
+ arvados_cwl_runner_iteration=3
+ iterargs+=(--iteration $arvados_cwl_runner_iteration)
+else
+ arvados_cwl_runner_iteration=
+fi