take src/oracle_test/modules/injection_points/Makefile for example:

-REGRESS = injection_points hashagg reindex_conc vacuum
-REGRESS_OPTS = --dlpath=$(top_builddir)/src/oracle_test/regress
+ORA_REGRESS = injection_points hashagg reindex_conc vacuum
+ORACLE_REGRESS_OPTS = --dlpath=$(top_builddir)/src/oracle_test/regress