diff --git a/autoconf.spec b/autoconf.spec
index 010b70ef5f99029e4d47c2d8bc33dfeb4fef509f..c9222c4effcdc326f51d375e62dee1487dafd8e0 100644
--- a/autoconf.spec
+++ b/autoconf.spec
@@ -3,7 +3,7 @@
 
 Name:           autoconf
 Version:        2.71
-Release:        8
+Release:        9
 Summary:        An extensible package to automatically configure software source code packages
 License:        GPLv2+ and GPLv3+ and GFDL-1.3-only
 URL:            https://www.gnu.org/software/%{name}/
@@ -13,7 +13,6 @@ Source2:        autoconf-el.el
 
 Patch1:         backport-_AC_PROG_CXX_STDCXX_EDITION_TRY-fix-typo-in-variable.patch
 Patch2:         backport-Fix-testsuite-failures-with-bash-5.2.patch
-Patch3:         backport-Port-AC_LANG_CALL-C-to-C.patch.patch
 
 Patch9000:      skip-one-test-at-line-1616-of-autotest.patch
 
@@ -74,6 +73,9 @@ fi
 
 
 %changelog
+* Fri Dec 06 2024 Funda Wang <fundawang@yeah.net> - 2.71-9
+- revert previous fix, as it causes too many regressions
+
 * Wed Dec 04 2024 Funda Wang <fundawang@yeah.net> - 2.71-8
 - fix AC_CHECK_LIB no longer works with g++ (debian bug#992981)
 
diff --git a/backport-Port-AC_LANG_CALL-C-to-C.patch.patch b/backport-Port-AC_LANG_CALL-C-to-C.patch.patch
deleted file mode 100644
index da50fc044f737e76a93e568848c03e6e66d2fb2e..0000000000000000000000000000000000000000
--- a/backport-Port-AC_LANG_CALL-C-to-C.patch.patch
+++ /dev/null
@@ -1,36 +0,0 @@
-From b27bc3e230bb12fdd9a813e38e82bc4c3e22b4cc Mon Sep 17 00:00:00 2001
-From: Paul Eggert <eggert@cs.ucla.edu>
-Date: Tue, 31 Aug 2021 16:30:46 -0700
-Subject: [PATCH] Port AC_LANG_CALL(C) to C++
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-* lib/autoconf/c.m4 (AC_LANG_CALL(C)): Add an extern "C" if C++.
-Problem reported by Vincent Lefèvre (sr #110532).
----
- lib/autoconf/c.m4 | 8 +++++++-
- 1 file changed, 7 insertions(+), 1 deletion(-)
-
-diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
-index 44443a39..48bd49a3 100644
---- a/lib/autoconf/c.m4
-+++ b/lib/autoconf/c.m4
-@@ -126,7 +126,13 @@ m4_define([AC_LANG_CALL(C)],
- m4_if([$2], [main], ,
- [/* Override any GCC internal prototype to avoid an error.
-    Use char because int might match the return type of a GCC
--   builtin and then its argument prototype would still apply.  */
-+   builtin and then its argument prototype would still apply.
-+   The 'extern "C"' is for builds by C++ compilers;
-+   although this is not generally supported in C code, supporting it here
-+   has little cost and some practical benefit (sr 110532).  */
-+#ifdef __cplusplus
-+extern "C"
-+#endif
- char $2 ();])], [return $2 ();])])
- 
- 
--- 
-2.43.5
-