-SANITY_IMPORT_VPP_PAPI_CMD=source $(PYTHON_VENV_PATH)/bin/activate && python sanity_import_vpp_papi.py
-SANITY_RUN_VPP_CMD=source $(PYTHON_VENV_PATH)/bin/activate && python sanity_run_vpp.py
+SANITY_IMPORT_VPP_PAPI_CMD=source $(VENV_PATH)/bin/activate && python sanity_import_vpp_papi.py
+SANITY_RUN_VPP_CMD=source $(VENV_PATH)/bin/activate && python sanity_run_vpp.py
+endif
+
+ifndef TEST_JOBS
+PARALLEL_ILLEGAL=0
+else ifeq ($(FORCE_FOREGROUND),0)
+PARALLEL_ILLEGAL=0
+else ifeq ($(TEST_JOBS),auto)
+PARALLEL_ILLEGAL=0
+else ifeq ($(TEST_JOBS),1)
+PARALLEL_ILLEGAL=0
+else
+PARALLEL_ILLEGAL=1