diff --git a/lib/libspl/strlcat.c b/lib/libspl/strlcat.c
deleted file mode 100644
index 4b3113cae0..0000000000
--- a/lib/libspl/strlcat.c
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * CDDL HEADER START
- *
- * The contents of this file are subject to the terms of the
- * Common Development and Distribution License (the "License").
- * You may not use this file except in compliance with the License.
- *
- * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
- * See the License for the specific language governing permissions
- * and limitations under the License.
- *
- * When distributing Covered Code, include this CDDL HEADER in each
- * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
- * If applicable, add the following below this CDDL HEADER, with the
- * fields enclosed by brackets "[]" replaced with your own identifying
- * information: Portions Copyright [yyyy] [name of copyright owner]
- *
- * CDDL HEADER END
- */
-
-/*
- * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
- */
-
-#pragma ident	"%Z%%M%	%I%	%E% SMI"
-
-#include <string.h>
-
-/*
- * Appends src to the dstsize buffer at dst. The append will never
- * overflow the destination buffer and the buffer will always be null
- * terminated. Never reference beyond &dst[dstsize-1] when computing
- * the length of the pre-existing string.
- */
-
-size_t
-strlcat(char *dst, const char *src, size_t dstsize)
-{
-	char *df = dst;
-	size_t left = dstsize;
-	size_t l1;
-	size_t l2 = strlen(src);
-	size_t copied;
-
-	while (left-- != 0 && *df != '\0')
-		df++;
-	l1 = df - dst;
-	if (dstsize == l1)
-		return (l1 + l2);
-
-	copied = l1 + l2 >= dstsize ? dstsize - l1 - 1 : l2;
-	(void) memcpy(dst + l1, src, copied);
-	dst[l1+copied] = '\0';
-	return (l1 + l2);
-}
diff --git a/lib/libspl/strlcpy.c b/lib/libspl/strlcpy.c
deleted file mode 100644
index 737c5d6926..0000000000
--- a/lib/libspl/strlcpy.c
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- * CDDL HEADER START
- *
- * The contents of this file are subject to the terms of the
- * Common Development and Distribution License (the "License").
- * You may not use this file except in compliance with the License.
- *
- * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
- * See the License for the specific language governing permissions
- * and limitations under the License.
- *
- * When distributing Covered Code, include this CDDL HEADER in each
- * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
- * If applicable, add the following below this CDDL HEADER, with the
- * fields enclosed by brackets "[]" replaced with your own identifying
- * information: Portions Copyright [yyyy] [name of copyright owner]
- *
- * CDDL HEADER END
- */
-
-/*
- * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
- */
-
-#pragma ident	"%Z%%M%	%I%	%E% SMI"
-
-#include <string.h>
-
-/*
- * Copies src to the dstsize buffer at dst. The copy will never
- * overflow the destination buffer and the buffer will always be null
- * terminated.
- */
-
-size_t
-strlcpy(char *dst, const char *src, size_t len)
-{
-	size_t slen = strlen(src);
-	size_t copied;
-
-	if (len == 0)
-		return (slen);
-
-	if (slen >= len)
-		copied = len - 1;
-	else
-		copied = slen;
-	(void) memcpy(dst, src, copied);
-	dst[copied] = '\0';
-	return (slen);
-}
diff --git a/lib/libspl/strnlen.c b/lib/libspl/strnlen.c
deleted file mode 100644
index 61962cb31a..0000000000
--- a/lib/libspl/strnlen.c
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * CDDL HEADER START
- *
- * The contents of this file are subject to the terms of the
- * Common Development and Distribution License (the "License").
- * You may not use this file except in compliance with the License.
- *
- * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
- * See the License for the specific language governing permissions
- * and limitations under the License.
- *
- * When distributing Covered Code, include this CDDL HEADER in each
- * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
- * If applicable, add the following below this CDDL HEADER, with the
- * fields enclosed by brackets "[]" replaced with your own identifying
- * information: Portions Copyright [yyyy] [name of copyright owner]
- *
- * CDDL HEADER END
- */
-
-/*
- * Copyright 2008 Sun Microsystems, Inc.
- * All rights reserved.  Use is subject to license terms.
- */
-
-#pragma ident	"%Z%%M%	%I%	%E% SMI"
-
-#include <string.h>
-
-/*
- * Returns the number of non-NULL bytes in string argument,
- * but not more than maxlen.  Does not look past str + maxlen.
- */
-size_t
-strnlen(const char *str, size_t maxlen)
-{
-	const char *ptr;
-
-	ptr = memchr(str, 0, maxlen);
-	if (ptr == NULL)
-		return (maxlen);
-
-	return (ptr - str);
-}