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diff --git a/tops20/zipup.h b/tops20/zipup.h
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+/*
+ Copyright (c) 1990-1999 Info-ZIP. All rights reserved.
+
+ See the accompanying file LICENSE, version 1999-Oct-05 or later
+ (the contents of which are also included in zip.h) for terms of use.
+ If, for some reason, both of these files are missing, the Info-ZIP license
+ also may be found at: ftp://ftp.cdrom.com/pub/infozip/license.html
+*/
+#define O_RDONLY (0)
+#define O_UNCONVERTED (0400) /* Forced NO conversion requested */
+#define fhow (O_RDONLY | O_UNCONVERTED)
+#define fbad (-1)
+typedef int ftype;
+#define zopen(n,p) open(n,p)
+#define zread(f,b,n) read(f,b,n)
+#define zclose(f) close(f)
+#define zerr(f) (k == (extent)(-1L))
+#define zstdin 0