diff --git a/autoconf.spec b/autoconf.spec
index 6ecfdbcaed232e46d60b2b0d624361d1acfd7513..689c2eb46c953757cc96d52baf2993aac70eaf23 100644
--- a/autoconf.spec
+++ b/autoconf.spec
@@ -3,7 +3,7 @@
 
 Name:           autoconf
 Version:        2.72
-Release:        2
+Release:        3
 Summary:        An extensible package to automatically configure software source code packages
 License:        GPL-2.0-or-later AND GPL-3.0-or-later and GFDL-1.3-or-later
 URL:            https://www.gnu.org/software/%{name}/
@@ -11,6 +11,8 @@ Source0:        https://ftp.gnu.org/gnu/%{name}/%{name}-%{version}.tar.xz
 Source1:        config.site
 Source2:        autoconf-el.el
 
+Patch0:         backport-Remove-incorrect-check-in-AC_CHECK_SIZEOF.patch
+
 BuildArch:      noarch
 
 BuildRequires:  m4 emacs perl perl-generators help2man gcc-c++
@@ -57,6 +59,9 @@ install -p -D %{S:2} %{buildroot}%{_emacs_sitestartdir}/autoconf-el.el
 %{_mandir}/man1/*
 
 %changelog
+* Wed Aug 27 2025 fuanan <fuanan3@h-partners.com> - 2.72-3
+- Remove incorrect check in AC_CHECK_SIZEOF
+
 * Sun Oct 27 2024 Funda Wang <fundawang@yeah.net> - 2.72-2
 - cleanup spec
 
diff --git a/backport-Remove-incorrect-check-in-AC_CHECK_SIZEOF.patch b/backport-Remove-incorrect-check-in-AC_CHECK_SIZEOF.patch
new file mode 100644
index 0000000000000000000000000000000000000000..a4f5086a3505d70f1c477cbb51ce12dd08efd0d5
--- /dev/null
+++ b/backport-Remove-incorrect-check-in-AC_CHECK_SIZEOF.patch
@@ -0,0 +1,53 @@
+From 51dec81849467973b1ef6d3fc8318b5b4f34b1c4 Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Wed, 7 Feb 2024 12:42:04 -0800
+Subject: [PATCH] Remove incorrect check in AC_CHECK_SIZEOF
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+* lib/autoconf/types.m4 (AC_CHECK_SIZEOF, AC_CHECK_ALIGNOF):
+When the size or alignment cannot be determined, do not fail if
+ac_cv_type_$1 is yes, as there’s no guarantee that ac_cv_type_$1
+is defined, and failure here would contradict the documentation
+that the size or alignment is 0 when sizeof($1)/alignof($1) cannot
+be compiled.  The test for ac_cv_type_$1 made sense long ago when
+it was checked for in these macros, but the test has not made
+sense for many years.
+---
+ lib/autoconf/types.m4 | 12 ++----------
+ 1 file changed, 2 insertions(+), 10 deletions(-)
+
+diff --git a/lib/autoconf/types.m4 b/lib/autoconf/types.m4
+index 8ed2f155..f231fcfc 100644
+--- a/lib/autoconf/types.m4
++++ b/lib/autoconf/types.m4
+@@ -837,11 +837,7 @@ AC_DEFUN([AC_CHECK_SIZEOF],
+ _AC_CACHE_CHECK_INT([size of $1], [AS_TR_SH([ac_cv_sizeof_$1])],
+   [(long int) (sizeof ($1))],
+   [AC_INCLUDES_DEFAULT([$3])],
+-  [if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then
+-     AC_MSG_FAILURE([cannot compute sizeof ($1)], 77)
+-   else
+-     AS_TR_SH([ac_cv_sizeof_$1])=0
+-   fi])
++  [AS_TR_SH([ac_cv_sizeof_$1])=0])
+ 
+ AC_DEFINE_UNQUOTED(AS_TR_CPP(sizeof_$1), $AS_TR_SH([ac_cv_sizeof_$1]),
+ 		   [The size of '$1', as computed by sizeof.])
+@@ -866,11 +862,7 @@ _AC_CACHE_CHECK_INT([alignment of $1], [AS_TR_SH([ac_cv_alignof_$3])],
+   [(long int) offsetof (ac__type_alignof_, y)],
+   [AC_INCLUDES_DEFAULT([$2])
+ typedef struct { char x; $1 y; } ac__type_alignof_;],
+-  [if test "$AS_TR_SH([ac_cv_type_$3])" = yes; then
+-     AC_MSG_FAILURE([cannot compute alignment of $1], 77)
+-   else
+-     AS_TR_SH([ac_cv_alignof_$3])=0
+-   fi])
++  [AS_TR_SH([ac_cv_alignof_$3])=0])
+ 
+ AC_DEFINE_UNQUOTED(AS_TR_CPP(alignof_$3), $AS_TR_SH([ac_cv_alignof_$3]),
+ 		   [The normal alignment of '$1', in bytes.])
+-- 
+2.33.0
+