diff --git a/sys/lib/libz/infblock.c b/sys/lib/libz/infblock.c
index 1f152b1a140c..eeb132b6b0cf 100644
--- a/sys/lib/libz/infblock.c
+++ b/sys/lib/libz/infblock.c
@@ -1,4 +1,4 @@
-/* $NetBSD: infblock.c,v 1.4 2002/03/12 00:42:23 fvdl Exp $ */
+/* $NetBSD: infblock.c,v 1.5 2003/03/18 20:00:47 mycroft Exp $ */
 
 /* infblock.c -- interpret and process block types to last block
  * Copyright (C) 1995-2002 Mark Adler
@@ -157,7 +157,7 @@ int r;
                  s->last ? " (last)" : ""));
           {
             uInt bl, bd;
-            inflate_huft *tl, *td;
+            const inflate_huft *tl, *td;
 
             inflate_trees_fixed(&bl, &bd, &tl, &td, z);
             s->sub.decode.codes = inflate_codes_new(bl, bd, tl, td, z);
diff --git a/sys/lib/libz/infcodes.c b/sys/lib/libz/infcodes.c
index bf4f91e058cb..d16f6e4af5e1 100644
--- a/sys/lib/libz/infcodes.c
+++ b/sys/lib/libz/infcodes.c
@@ -1,4 +1,4 @@
-/* $NetBSD: infcodes.c,v 1.4 2002/03/12 00:42:23 fvdl Exp $ */
+/* $NetBSD: infcodes.c,v 1.5 2003/03/18 20:00:47 mycroft Exp $ */
 
 /* infcodes.c -- process literals and length/distance pairs
  * Copyright (C) 1995-2002 Mark Adler
@@ -39,7 +39,7 @@ struct inflate_codes_state {
   uInt len;
   union {
     struct {
-      inflate_huft *tree;       /* pointer into tree */
+      const inflate_huft *tree; /* pointer into tree */
       uInt need;                /* bits needed */
     } code;             /* if LEN or DIST, where in tree */
     uInt lit;           /* if LIT, literal */
@@ -52,16 +52,16 @@ struct inflate_codes_state {
   /* mode independent information */
   Byte lbits;           /* ltree bits decoded per branch */
   Byte dbits;           /* dtree bits decoder per branch */
-  inflate_huft *ltree;          /* literal/length/eob tree */
-  inflate_huft *dtree;          /* distance tree */
+  const inflate_huft *ltree;    /* literal/length/eob tree */
+  const inflate_huft *dtree;    /* distance tree */
 
 };
 
 
 inflate_codes_statef *inflate_codes_new(bl, bd, tl, td, z)
 uInt bl, bd;
-inflate_huft *tl;
-inflate_huft *td; /* need separate declaration for Borland C++ */
+const inflate_huft *tl;
+const inflate_huft *td; /* need separate declaration for Borland C++ */
 z_streamp z;
 {
   inflate_codes_statef *c;
@@ -86,7 +86,7 @@ z_streamp z;
 int r;
 {
   uInt j;               /* temporary storage */
-  inflate_huft *t;      /* temporary pointer */
+  const inflate_huft *t;/* temporary pointer */
   uInt e;               /* extra bits or operation */
   uLong b;              /* bit buffer */
   uInt k;               /* bits in bit buffer */
diff --git a/sys/lib/libz/infcodes.h b/sys/lib/libz/infcodes.h
index 6d999f8e603c..4b6b1ac2c6af 100644
--- a/sys/lib/libz/infcodes.h
+++ b/sys/lib/libz/infcodes.h
@@ -1,4 +1,4 @@
-/* $NetBSD: infcodes.h,v 1.4 2002/03/12 00:42:23 fvdl Exp $ */
+/* $NetBSD: infcodes.h,v 1.5 2003/03/18 20:00:48 mycroft Exp $ */
 
 /* infcodes.h -- header to use infcodes.c
  * Copyright (C) 1995-2002 Mark Adler
@@ -15,7 +15,7 @@ typedef struct inflate_codes_state FAR inflate_codes_statef;
 
 extern inflate_codes_statef *inflate_codes_new __P((
     uInt, uInt,
-    inflate_huft *, inflate_huft *,
+    const inflate_huft *, const inflate_huft *,
     z_streamp ));
 
 extern int inflate_codes __P((
diff --git a/sys/lib/libz/inffast.c b/sys/lib/libz/inffast.c
index cd62e711485c..ebebe4bfe799 100644
--- a/sys/lib/libz/inffast.c
+++ b/sys/lib/libz/inffast.c
@@ -1,4 +1,4 @@
-/* $NetBSD: inffast.c,v 1.4 2002/03/12 00:42:23 fvdl Exp $ */
+/* $NetBSD: inffast.c,v 1.5 2003/03/18 20:00:48 mycroft Exp $ */
 
 /* inffast.c -- process literals and length/distance pairs fast
  * Copyright (C) 1995-2002 Mark Adler
@@ -29,12 +29,12 @@ struct inflate_codes_state {int dummy;}; /* for buggy compilers */
 
 int inflate_fast(bl, bd, tl, td, s, z)
 uInt bl, bd;
-inflate_huft *tl;
-inflate_huft *td; /* need separate declaration for Borland C++ */
+const inflate_huft *tl;
+const inflate_huft *td; /* need separate declaration for Borland C++ */
 inflate_blocks_statef *s;
 z_streamp z;
 {
-  inflate_huft *t;      /* temporary pointer */
+  const inflate_huft *t;/* temporary pointer */
   uInt e;               /* extra bits or operation */
   uLong b;              /* bit buffer */
   uInt k;               /* bits in bit buffer */
diff --git a/sys/lib/libz/inffast.h b/sys/lib/libz/inffast.h
index 92bf8adcad9b..e46650055e0e 100644
--- a/sys/lib/libz/inffast.h
+++ b/sys/lib/libz/inffast.h
@@ -1,4 +1,4 @@
-/* $NetBSD: inffast.h,v 1.4 2002/03/12 00:42:24 fvdl Exp $ */
+/* $NetBSD: inffast.h,v 1.5 2003/03/18 20:00:48 mycroft Exp $ */
 
 /* inffast.h -- header to use inffast.c
  * Copyright (C) 1995-2002 Mark Adler
@@ -13,7 +13,7 @@
 extern int inflate_fast __P((
     uInt,
     uInt,
-    inflate_huft *,
-    inflate_huft *,
+    const inflate_huft *,
+    const inflate_huft *,
     inflate_blocks_statef *,
     z_streamp ));