$NetBSD$

Use standard headers.

--- playback.c~	2004-05-18 20:56:52.000000000 +0000
+++ playback.c
@@ -9,6 +9,7 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <string.h>
 
 #include "jcabc2ps.h"
 #include "util.h"
