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diff --git a/src/Makefile b/src/Makefile
index afb82a6..ec2b910 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,55 +1,61 @@
-CC ?= gcc
-CFLAGS ?= -g -Wall -Wextra -I $(INCLUDE)
-RMF ?= rm -f
-WHICH ?= which
-CTAGS ?= ctags
-ETAGS ?= etags
-SED ?= sed
+INCLUDEDIR := ../include
+INCLUDE = -I $(INCLUDEDIR)
 
-INCLUDE := ../include
+# コマンド
+CC := gcc
+CFLAGS := -g -Wall -Wextra $(INCLUDE)
+CTAGS := ctags
+ETAGS := etags
+ECHO := echo
+SED := sed
+WHICH := which
 
-COMMONSRC := word.c cmem.c cerr.c
-CASL2SRC := struct.c hash.c
-ASSRC := assemble.c token.c label.c
-EXECSRC := exec.c dump.c
+# ソースの分類
+CMDOBJ := casl2 comet2 dumpword
+COMMONOBJ := word cmem cerr
+CASL2OBJ := struct hash
+ASOBJ := assemble token label
+EXECOBJ := exec dump
 
-.PHONY: all clean
+.PHONY: all build tag clean
 
-all: ../casl2 ../comet2 ../dumpword ctags etags
+all: build tag
 
-../casl2: casl2.o $(subst .c,.o,$(COMMONSRC) $(CASL2SRC) $(ASSRC) $(EXECSRC))
-	$(CC) $(CFLAGS) -o $@ $^
-	@$(RMF) *.d
+# casl2、comet2、dumpwordのビルド
+build: $(CMDOBJ)
 
-../comet2: comet2.o $(subst .c,.o,$(COMMONSRC) $(CASL2SRC) $(EXECSRC))
-	$(CC) $(CFLAGS) -o $@ $^
-	@$(RMF) *.d
+casl2: casl2.o $(addsuffix .o,$(COMMONOBJ) $(CASL2OBJ) $(ASOBJ) $(EXECOBJ))
 
-../dumpword: dumpword.o $(subst .c,.o,$(COMMONSRC))
-	$(CC) $(CFLAGS) -o $@ $^
-	@$(RMF) *.d
+comet2: comet2.o $(addsuffix .o,$(COMMONOBJ) $(CASL2OBJ) $(EXECOBJ))
 
-%.o: %.c
-	$(CC) -c $(CFLAGS) $<
+dumpword: dumpword.o $(addsuffix .o,$(COMMONOBJ))
 
-%.d: %.c
-	@$(CC) -MM -I $(INCLUDE) $< | $(SED) 's/\($*\.o\):/\1 $@:/g' >$@
+# .dファイルからヘッダファイルの依存関係を取得する
+# tags、check、cleanで終わるターゲットの場合は除く
+ifeq (,$(strip $(filter %tags,$(MAKECMDGOALS)) $(filter %check,$(MAKECMDGOALS))  $(filter %clean,$(MAKECMDGOALS))))
+  -include $(addsuffix .d,$(CMDOBJ) $(COMMONOBJ) $(CASL2OBJ) $(ASOBJ) $(EXECOBJ))
+endif
 
--include $(subst .c,.d,casl2.c comet2.c dumpword.c $(COMMONSRC) $(CASL2SRC) $(ASSRC) $(EXECSRC))
+# tagファイル作成 - ctags & etags
+# コマンドがない場合はなにもしない
+tag: tags TAGS
 
-ctags: $(INCLUDE)/*.h *.c
-	@$(WHICH) $(CTAGS) >/dev/null && $(CTAGS) $^
+tags: $(INCLUDEDIR)/*.h *.c
+	$(if $(strip $(shell $(WHICH) $(CTAGS))),$(CTAGS) $^,@$(ECHO) '$(CTAGS): not found')
 
-etags: $(INCLUDE)/*.h *.c
-	@$(WHICH) $(ETAGS) >/dev/null && $(ETAGS) $^
+TAGS: $(INCLUDEDIR)/*.h *.c
+	$(if $(strip $(shell $(WHICH) $(ETAGS))),$(ETAGS) $^,@$(ECHO) '$(ETAGS): not found')
 
-clean: clean_cmd clean_build clean_tags
+# makeで生成したファイルの削除
+distclean: clean
+	@$(RM) casl2 comet2 dumpword
 
-clean_cmd:
-	@$(RMF) ../casl2 ../comet2 ../dumpword
+clean: tag-clean
+	@$(RM) *.o *.d
 
-clean_build:
-	@$(RMF) *.o *.d
+tag-clean:
+	@$(RM) TAGS tags
 
-clean_tags:
-	@$(RMF) TAGS tags
+# ヘッダファイルの依存関係を.dファイルに出力する
+%.d: %.c
+	$(CC) -MM -I $(INCLUDEDIR) $< | $(SED) 's/\($*\.o\):/\1 $@:/g' >$@