-MAKEFILEDIR = $(shell dirname $(lastword $(MAKEFILE_LIST)))
+TOP_LTTNG_MODULES_DIR := $(shell dirname $(lastword $(MAKEFILE_LIST)))/..
-include $(MAKEFILEDIR)/../Makefile.ABI.workarounds
+include $(TOP_LTTNG_MODULES_DIR)/Makefile.ABI.workarounds
+
+ccflags-y += -I$(TOP_LTTNG_MODULES_DIR)
obj-$(CONFIG_LTTNG) += lttng-lib-ring-buffer.o