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diff --git a/tiff/port/strcasecmp.c b/tiff/port/strcasecmp.c
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+/* $Id: strcasecmp.c,v 1.3 2009-01-22 20:53:07 fwarmerdam Exp $ */
+
+/*
+ * Copyright (c) 1987, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if 0
+static char sccsid[] = "@(#)strcasecmp.c 8.1 (Berkeley) 6/4/93";
+__RCSID("$NetBSD: strcasecmp.c,v 1.16 2003/08/07 16:43:49 agc Exp $");
+#endif
+
+#include <ctype.h>
+#include <string.h>
+#include "libport.h"
+
+int
+strcasecmp(const char *s1, const char *s2)
+{
+ const unsigned char *us1 = (const unsigned char *)s1,
+ *us2 = (const unsigned char *)s2;
+
+ while (tolower(*us1) == tolower(*us2++))
+ if (*us1++ == '\0')
+ return (0);
+ return (tolower(*us1) - tolower(*--us2));
+}