--- a/miscutil/Makefile	Sat Apr 22 20:57:11 2023 +0000
+++ b/miscutil/Makefile	Sun Apr 23 03:36:25 2023 +0000
@@ -1,6 +1,7 @@
 CC=	gcc
 CFLAGS=	-O2
-PROGS=	gsmrec-dump pcm16-raw2wav pcm16-to-alaw pcm16-to-ulaw pcm16-wav2raw
+PROGS=	gsmrec-dump pcm16-check13 pcm16-raw2wav pcm16-to-alaw pcm16-to-ulaw \
+	pcm16-wav2raw
 LIBEFR=	../libgsmefr/libgsmefr.a
 LIBTEST=../libtest/libtest.a
 INSTBIN=/opt/freecalypso/bin
@@ -10,6 +11,9 @@
 gsmrec-dump:	gsmrec-dump.o ${LIBTEST} ${LIBEFR}
 	${CC} ${CFLAGS} -o $@ gsmrec-dump.o ${LIBTEST} ${LIBEFR} -lgsm
 
+pcm16-check13:	pcm16-check13.c
+	${CC} ${CFLAGS} -o $@ $@.c
+
 pcm16-raw2wav:	raw2wav.o ${LIBTEST}
 	${CC} ${CFLAGS} -o $@ raw2wav.o ${LIBTEST}