--- a/cp2102/Makefile	Mon Sep 11 18:56:04 2023 +0000
+++ b/cp2102/Makefile	Mon Sep 11 19:45:56 2023 +0000
@@ -1,6 +1,7 @@
 CC=	gcc
 CFLAGS=	-O2
 PROGS=	cp2102-read-eeprom cp2102-read-partno
+NOINST=	file_rw_test
 LIBS=	../libuwrap/libuwrap.a
 
 INSTALL_PREFIX=	/opt/freecalypso
@@ -9,7 +10,9 @@
 
 READ_EEPROM_OBJS=	intel_hex_out.o read_eeprom.o read_eeprom_main.o
 
-all:	${PROGS}
+RW_TEST_OBJS=		intel_hex_in.o intel_hex_out.o file_rw_test.o
+
+all:	${PROGS} ${NOINST}
 
 cp2102-read-eeprom:	${READ_EEPROM_OBJS} ${LIBS}
 	${CC} ${CFLAGS} -o $@ ${READ_EEPROM_OBJS} ${LIBS} -lusb
@@ -17,9 +20,12 @@
 cp2102-read-partno:	read_partno.o ${LIBS}
 	${CC} ${CFLAGS} -o $@ read_partno.o ${LIBS} -lusb
 
+file_rw_test:		${RW_TEST_OBJS}
+	${CC} ${CFLAGS} -o $@ ${RW_TEST_OBJS}
+
 install:
 	mkdir -p ${INSTBIN}
 	install -c ${PROGS} ${INSTBIN}
 
 clean:
-	rm -f ${PROGS} *.o *errs *.out
+	rm -f ${PROGS} ${NOINST} *.o *errs *.out