diff --git a/UPDATING b/UPDATING
index 4786a59dadaa..476ead882183 100644
--- a/UPDATING
+++ b/UPDATING
@@ -1,4 +1,4 @@
-$NetBSD: UPDATING,v 1.349 2024/04/23 03:25:39 maya Exp $
+$NetBSD: UPDATING,v 1.350 2024/05/05 02:50:11 riastradh Exp $
 
 This file (UPDATING) is intended to be a brief reference to recent
 changes that might cause problems in the build process, and a guide for
@@ -19,6 +19,10 @@ See also: BUILDING, build.sh, Makefile.
 Recent changes:
 ^^^^^^^^^^^^^^^
 
+20240504:
+	Update builds on x86 require making the `cleandir' target in
+	lib/libm, or deleting the objdir for lib/libm.
+
 20240423:
 	Update builds with x11 may fail after switching to Mesa 21.
 
diff --git a/lib/libm/Makefile b/lib/libm/Makefile
index 8cb8861ade8c..19db64eb6380 100644
--- a/lib/libm/Makefile
+++ b/lib/libm/Makefile
@@ -1,4 +1,4 @@
-#  $NetBSD: Makefile,v 1.227 2024/03/26 20:12:47 rillig Exp $
+#  $NetBSD: Makefile,v 1.228 2024/05/05 02:50:11 riastradh Exp $
 #
 #  @(#)Makefile 5.1beta 93/09/24
 #
@@ -131,8 +131,10 @@ ARCH_SRCS = e_acos.S e_asin.S e_atan2.S e_exp.S e_expf.S e_fmod.S e_log.S \
 	    s_atanf.S s_ceil.S s_ceilf.S s_copysign.S s_copysignf.S \
 	    s_finite.S s_finitef.S s_floor.S s_floorf.S \
 	    s_log1p.S s_log1pf.S s_logb.S s_logbf.S s_logbl.S \
-	    s_rint.S s_rintf.S s_scalbn.S s_scalbnf.S s_significand.S \
-	    s_significandf.S lrint.S
+	    s_rint.S s_rintf.S s_rintl.S \
+	    s_scalbn.S s_scalbnf.S \
+	    s_significand.S s_significandf.S \
+	    lrint.S
 # do not pick up the i387 asm version for the following functions;
 # it is incorrect
 .for f in cos cosf modf ilogb ilogbl ilogbf sin sinf tan tanf
diff --git a/lib/libm/arch/i387/s_rintl.S b/lib/libm/arch/i387/s_rintl.S
new file mode 100644
index 000000000000..0b56efb41474
--- /dev/null
+++ b/lib/libm/arch/i387/s_rintl.S
@@ -0,0 +1,39 @@
+/*	$NetBSD: s_rintl.S,v 1.1 2024/05/05 02:50:11 riastradh Exp $	*/
+
+/*-
+ * Copyright (c) 2024 The NetBSD Foundation, Inc.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#include <machine/asm.h>
+
+#include "abi.h"
+
+RCSID("$NetBSD: s_rintl.S,v 1.1 2024/05/05 02:50:11 riastradh Exp $")
+
+ENTRY(rintl)
+	fldt	ARG_LONG_DOUBLE_ONE
+	frndint
+	ret
+END(rintl)