# Check that only one implementation of pktbuf is used
USED_PKTBUF_IMPLEMENTATIONS := $(filter-out gnrc_pktbuf_cmd,$(filter gnrc_pktbuf_%,$(USEMODULE)))
ifneq (1,$(words $(USED_PKTBUF_IMPLEMENTATIONS)))
  $(error Only one implementation of gnrc_pktbuf should be used. Currently using: $(USED_PKTBUF_IMPLEMENTATIONS))
endif

USEMODULE_INCLUDES_gnrc_pktbuf := $(LAST_MAKEFILEDIR)/include
USEMODULE_INCLUDES += $(USEMODULE_INCLUDES_gnrc_pktbuf)