diff --git a/Makefile.include b/Makefile.include
index 8ac4a13bb..4ab8e1d0e 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -61,6 +61,20 @@ savedefines:
 	@echo "saving Makefile.$(TARGET).defines"
 	@echo >Makefile.$(TARGET).defines "DEFINES = $(DEFINES)"
 
+viewconf:
+	@echo "---------- Make variables: ----------"
+	@echo "##### \"TARGET\": $(TARGET)"
+	@echo "##### \"BOARD\": $(BOARD)"
+	@echo "##### \"MAKE_MAC\": $(MAKE_MAC)"
+	@echo "##### \"MAKE_NET\": $(MAKE_NET)"
+	@echo "##### \"CONTIKI_WITH_RPL\": $(CONTIKI_WITH_RPL)"
+	@echo "##### \"CONTIKI_WITH_RPL_LITE\": $(CONTIKI_WITH_RPL_LITE)"
+	@echo "----------- C variables: ------------"
+	$(Q)$(CC) $(CFLAGS) -E $(CONTIKI)/tools/viewconf.c | grep \#\#\#\#\#
+	@echo "-------------------------------------"
+	@echo "To view more Make variables, edit $(CONTIKI)/Makefile.include, rule 'viewconf'"
+	@echo "To view more C variables, edit $(CONTIKI)/tools/viewconf.c"
+
 OBJECTDIR = obj_$(TARGET)
 
 LOWERCASE = -abcdefghijklmnopqrstuvwxyz/
diff --git a/tools/viewconf.c b/tools/viewconf.c
new file mode 100644
index 000000000..e33dee228
--- /dev/null
+++ b/tools/viewconf.c
@@ -0,0 +1,29 @@
+#include "contiki.h"
+
+##### "PROJECT_CONF_PATH": PROJECT_CONF_PATH
+##### "MAC_CONF_WITH_NULLMAC": MAC_CONF_WITH_NULLMAC
+##### "MAC_CONF_WITH_CSMA": MAC_CONF_WITH_CSMA
+##### "MAC_CONF_WITH_TSCH": MAC_CONF_WITH_TSCH
+##### "MAC_CONF_WITH_OTHER": MAC_CONF_WITH_OTHER
+##### "NETSTACK_CONF_WITH_NULLNET": NETSTACK_CONF_WITH_NULLNET
+##### "NETSTACK_CONF_WITH_IPV6": NETSTACK_CONF_WITH_IPV6
+##### "NETSTACK_CONF_WITH_OTHER": NETSTACK_CONF_WITH_OTHER
+##### "CONTIKI_VERSION_STRING": CONTIKI_VERSION_STRING
+##### "AUTOSTART_ENABLE": AUTOSTART_ENABLE
+##### "QUEUEBUF_CONF_NUM": QUEUEBUF_CONF_NUM
+##### "NBR_TABLE_CONF_MAX_NEIGHBORS": NBR_TABLE_CONF_MAX_NEIGHBORS
+##### "NETSTACK_MAX_ROUTE_ENTRIES": NETSTACK_MAX_ROUTE_ENTRIES
+##### "UIP_CONF_BUFFER_SIZE": UIP_CONF_BUFFER_SIZE
+##### "UIP_CONF_ROUTER": UIP_CONF_ROUTER
+##### "NBR_TABLE_FIND_REMOVABLE": NBR_TABLE_FIND_REMOVABLE
+##### "UIP_CONF_UDP": UIP_CONF_UDP
+##### "UIP_CONF_UDP_CONNS": UIP_CONF_UDP_CONNS
+##### "UIP_CONF_TCP": UIP_CONF_TCP
+##### "UIP_CONF_TCP_CONNS": UIP_CONF_TCP_CONNS
+##### "UIP_CONF_ND6_SEND_RA": UIP_CONF_ND6_SEND_RA
+##### "UIP_CONF_ND6_SEND_NS": UIP_CONF_ND6_SEND_NS
+##### "UIP_CONF_ND6_AUTOFILL_NBR_CACHE": UIP_CONF_ND6_AUTOFILL_NBR_CACHE
+##### "UIP_CONF_ND6_SEND_NA": UIP_CONF_ND6_SEND_NA
+##### "SICSLOWPAN_CONF_FRAG": SICSLOWPAN_CONF_FRAG
+##### "SICSLOWPAN_CONF_MAC_MAX_PAYLOAD": SICSLOWPAN_CONF_MAC_MAX_PAYLOAD
+##### "SICSLOWPAN_CONF_COMPRESSION": SICSLOWPAN_CONF_COMPRESSION