diff --git a/lib/CPUs/MIPS/bsp/examples/Makefile b/lib/CPUs/MIPS/bsp/examples/Makefile
index aeac376..b03e46c 100644
--- a/lib/CPUs/MIPS/bsp/examples/Makefile
+++ b/lib/CPUs/MIPS/bsp/examples/Makefile
@@ -18,7 +18,7 @@ all: $(PROG)
 libsys: startup.S kernel.S libsys.c xcpt.c irq.c
 	$(CC) $(CFLAGS) -G 0 -c startup.S -o startup.o
 	$(CC) $(CFLAGS) -G 0 -c kernel.S -o kernel.o
-	$(CC) $(CFLAGS) -G 0 -DSTDERR_FUNCTION=_cg_putchar -DSTDOUT_FUNCTION=_ser_putchar -D_putchar=_ser_putchar -c libsys.c -o libsys.o
+	$(CC) $(CFLAGS) -G 0 -c libsys.c -o libsys.o
 	$(CC) $(CFLAGS) -G 0 -c xcpt.c -o xcpt.o
 	$(CC) $(CFLAGS) -G 0 -c irq.c -o irq.o
 	$(CC) $(CFLAGS) -G 0 -c dbg.c -o dbg.o