tests/zep: simplified Makefile

tests/zep/Makefile

@@ -14,31 +14,16 @@ USEMODULE += gnrc_pktdump
 USEMODULE += shell
 USEMODULE += shell_commands
 
-ifeq (,$(ZEP_DST))
-  # set default
-  CFLAGS += -DZEP_DST="\"::1\""
-else
-  CFLAGS += -DZEP_DST="\"$(ZEP_DST)\""
-endif
 
-ifeq (,$(ZEP_SRC_PORT))
-  # set default
-  CFLAGS += -DZEP_SRC_PORT=GNRC_ZEP_DEFAULT_PORT
-else
-  CFLAGS += -DZEP_SRC_PORT=$(ZEP_SRC_PORT)
-endif
+# set optional default values for ZEP parameters if unset
+ZEP_DST      ?= "\"::1\""
+ZEP_SRC_PORT ?= GNRC_ZEP_DEFAULT_PORT
+ZEP_DST_PORT ?= GNRC_ZEP_DEFAULT_PORT
 
-ifeq (,$(ZEP_DST_PORT))
-  # set default
-  CFLAGS += -DZEP_DST_PORT=GNRC_ZEP_DEFAULT_PORT
-else
-  CFLAGS += -DZEP_DST_PORT=$(ZEP_DST_PORT)
-endif
-
-# add current directory to the include path. Putting it in CFLAGS will make
-# it go to the beginning, before the standard includes.
-# That way xbee_params.h get's included and auto configuration can pick it up.
-CFLAGS += -I$(CURDIR)
+# export ZEP parameters
+CFLAGS += -DZEP_DST="\"$(ZEP_DST)\""
+CFLAGS += -DZEP_SRC_PORT=$(ZEP_SRC_PORT)
+CFLAGS += -DZEP_DST_PORT=$(ZEP_DST_PORT)
 
 # one for gnrc_netif_default and one for ZEP
 CFLAGS += -DGNRC_NETIF_NUMOF=2