Remove make import parameter

data/Makefile

@@ -1,12 +1,8 @@
 default:
-	@printf '%s\n' '>> Usage:' '      make import JMDICT_PATH=/path/to/jmdict' '      make export' '>> Refer to README.md for details.'
+	@printf '%s\n' '>> Usage:' '      make import' '      make export' '>> Refer to README.md for details.'
 
 import:
-ifeq ($(origin JMDICT_PATH),undefined)
-	@echo "ERROR: Run as \`make import JMDICT_PATH=/path/to/JMdict\`".
-	@false
-endif
-	go run preprocess-jmdict.go $(JMDICT_PATH)
+	go run preprocess-jmdict.go JMdict*.xml
 
 EXPORT_FILENAME ?= entrypack-v1-$(shell cat entrypack.json | grep -o 'Creation Date: [0-9-]*' | awk '{print$$3}').json.gz