diff --git a/ChangeLog b/ChangeLog
index 3945b8b..737bbc3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Sep 23 22:45:00 2008  Minero Aoki  <aamine@loveruby.net>
+
+	* lib/Makefile: parameterize.
+
 Tue Sep 23 20:42:38 2008  Minero Aoki  <aamine@loveruby.net>
 
 	* unit: new unit test suite.
diff --git a/lib/Makefile b/lib/Makefile
index 7bd2740..77ec7b1 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -1,10 +1,16 @@
+CBC = ../bin/cbc
+CBFLAGS = -O
+TARGET = libcbc.a
+OBJS = libcbc.o
+
 .SUFFIXES:
+.SUFFIXES: .cb .o
 
-libcbc.a: libcbc.o
-	ar cr libcbc.a libcbc.o
+.cb.o:
+	$(CBC) $(CBFLAGS) -c $< -o $@
 
-libcbc.o: libcbc.cb
-	../bin/cbc -O -c $< -o $@
+$(TARGET): $(OBJS)
+	ar cr $(TARGET) $(OBJS)
 
 clean:
-	rm -f libcbc.a *.o *.s
+	rm -f $(TARGET) *.o *.s