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--- Makefile.orig
+++ Makefile
@@ -1,17 +1,22 @@
-CXX		= g++
-LD		= g++
+CXX		?= g++
+LD		= $(CXX)
 CXXFILES	= parser.cc lexer.cc expr.cc canvas.cc aamath.cc
 OBJS		= $(CXXFILES:.cc=.o) 
 TARGET		= aamath
-CFLAGS		= -Wall -O2 -g -DUSE_READLINE
-LFLAGS		= -g
+CFLAGS		+= -Wall -DUSE_READLINE
 LIBS		= -lreadline -ltermcap
 
 $(TARGET): $(OBJS)
 	$(LD) $(LFLAGS) $(OBJS) -o $@ $(LIBS)
 
-parser.cc parser.h: parser.y
-	yacc -d parser.y && mv y.tab.c parser.cc && mv y.tab.h parser.h
+yacc: parser.y
+	yacc -d parser.y
+
+parser.cc: yacc
+	mv y.tab.c parser.cc
+
+parser.h: yacc
+	mv y.tab.h parser.h
 
 lexer.cc: lexer.l parser.h
 	lex lexer.l && mv lex.yy.c lexer.cc
@@ -21,3 +26,5 @@
 
 clean:
 	rm -f *.o lexer.cc parser.h parser.cc $(TARGET)
+
+all: $(TARGET)
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