diff --git a/test/client/Makefile b/test/client/Makefile
index 9e1b6dec..ffe29065 100644
--- a/test/client/Makefile
+++ b/test/client/Makefile
@@ -3,3 +3,8 @@ include ../test_common.mk
 EXTRA_C_FLAGS :=
 EXTRA_LINK_FLAGS :=
 BIN_ARGS :=
+
+CUSTOM_PRE_BUILD := 1
+
+custom_pre_build:
+	@echo "You can execute extra commands here before occlum build."
diff --git a/test/test_common.mk b/test/test_common.mk
index ee357d83..046b6cad 100644
--- a/test/test_common.mk
+++ b/test/test_common.mk
@@ -43,8 +43,11 @@ LINK_FLAGS = $(C_FLAGS) -pie $(EXTRA_LINK_FLAGS)
 #############################################################################
 # Build
 #############################################################################
+all: custom_pre_build $(ALL_BUILD_SUBDIRS) $(BIN) $(DEPS_FILE)
 
-all: $(ALL_BUILD_SUBDIRS) $(BIN) $(DEPS_FILE)
+ifneq ($(CUSTOM_PRE_BUILD), 1)
+custom_pre_build:
+endif
 
 $(ALL_BUILD_SUBDIRS):
 	@mkdir -p $@