-INCLUDE = ../include
-CC = gcc
-CFLAGS = -g -Wall -I $(INCLUDE)
-HASHSRC = hash.o
-CERRSRC = cerr.o
-WORDSRC = word.o
-COMMONSRC = $(WORDSRC) $(HASHSRC) $(CERRSRC) struct.o cmd.o
-ASSRC = assemble.o token.o label.o macro.o
-EXECSRC = exec.o dump.o
+INCLUDE := ../include
+CC := gcc
+CFLAGS := -g -Wall -I $(INCLUDE)
+RM := rm -f
+
+COMMONSRC := word.c cmem.c cerr.c
+CASL2SRC := struct.c cmd.c hash.c
+ASSRC := assemble.c token.c label.c
+EXECSRC := exec.c dump.c