--- a/Makefile
+++ b/Makefile
@@ -450,3 +450,7 @@ help:
 	@echo "  installcheck-existing  Run the regression suite against a running server"
 	@echo "  clean                  Remove build artifacts"
 	@echo "  help                   Show this message"
+
+# Set extension_control_path/dynamic_library_path
+# Set max_parallel_workers to suppress a "CONTEXT:  parallel worker" in regression tests
+export PGOPTIONS = -cextension_control_path=$(CURDIR)/debian/postgresql-$(MAJORVERSION)-age/usr/share/postgresql/$(MAJORVERSION):$$system -cdynamic_library_path=$(CURDIR)/debian/postgresql-$(MAJORVERSION)-age/usr/lib/postgresql/$(MAJORVERSION)/lib:/usr/lib/postgresql/$(MAJORVERSION)/lib -cmax_parallel_workers=0
