diff --git a/lib/zlib/zutil.c b/lib/zlib/zutil.c
new file mode 100644
index 0000000..65f9554
--- /dev/null
+++ b/lib/zlib/zutil.c
@@ -0,0 +1,73 @@
+/* zutil.c -- target dependent utility functions for the compression library
+ * Copyright (C) 1995-2005 Jean-loup Gailly.
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* @(#) $Id$ */
+
+#include "zutil.h"
+
+#ifndef NO_DUMMY_DECL
+struct internal_state      {int dummy;}; /* for buggy compilers */
+#endif
+
+const char * const z_errmsg[10] = {
+"need dictionary",     /* Z_NEED_DICT       2  */
+"stream end",          /* Z_STREAM_END      1  */
+"",                    /* Z_OK              0  */
+"file error",          /* Z_ERRNO         (-1) */
+"stream error",        /* Z_STREAM_ERROR  (-2) */
+"data error",          /* Z_DATA_ERROR    (-3) */
+"insufficient memory", /* Z_MEM_ERROR     (-4) */
+"buffer error",        /* Z_BUF_ERROR     (-5) */
+"incompatible version",/* Z_VERSION_ERROR (-6) */
+""};
+
+#ifdef DEBUG
+
+#ifndef verbose
+#define verbose 0
+#endif
+int z_verbose = verbose;
+
+void z_error (m)
+    char *m;
+{
+	fprintf(stderr, "%s\n", m);
+	hang ();
+}
+#endif
+
+/* exported to allow conversion of error code to string for compress() and
+ * uncompress()
+ */
+#ifndef MY_ZCALLOC /* Any system without a special alloc function */
+
+#ifndef STDC
+extern voidp    malloc OF((uInt size));
+extern voidp    calloc OF((uInt items, uInt size));
+extern void     free   OF((voidpf ptr));
+#endif
+
+voidpf zcalloc (opaque, items, size)
+	voidpf opaque;
+	unsigned items;
+	unsigned size;
+{
+	if (opaque)
+		items += size - size; /* make compiler happy */
+	return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
+		(voidpf)calloc(items, size);
+}
+
+void  zcfree (opaque, ptr, nb)
+	voidpf opaque;
+	voidpf ptr;
+	unsigned nb;
+{
+	free(ptr);
+	if (opaque)
+		return; /* make compiler happy */
+}
+
+#endif /* MY_ZCALLOC */