-RUNTIME_SRCS := runtime/runtime.c runtime/rcu.c runtime/lwt.c runtime/mem.c runtime/CuTest.c
-rcu_test_SRCS := $(RUNTIME_SRCS)
-list_test_SRCS := $(RUNTIME_SRCS) struct/list.c
-ht_test_SRCS := $(RUNTIME_SRCS) struct/ht.c struct/ht_test.c
+RUNTIME_SRCS := runtime/runtime.c runtime/rcu.c runtime/lwt.c runtime/mem.c
+TEST_SRCS := $(RUNTIME_SRCS)
+rcu_test_SRCS := $(TEST_SRCS)
+list_test_SRCS := $(TEST_SRCS) struct/list.c
+skiplist_test_SRCS := $(TEST_SRCS) struct/skiplist.c
+ht_test_SRCS := $(TEST_SRCS) struct/ht.c test/ht_test.c test/CuTest.c
+txn_test_SRCS := $(TEST_SRCS) struct/ht.c txn/txn.c