diff --git a/autoconf.spec b/autoconf.spec
index dd90a3b7e385520f9dc2e6b1fab7e7fc2bd2e1f7..d76d9f7653ad67a70a18be90ee22e269a5ed1091 100644
--- a/autoconf.spec
+++ b/autoconf.spec
@@ -3,7 +3,7 @@
 
 Name:           autoconf
 Version:        2.71
-Release:        3
+Release:        4
 Summary:        An extensible package to automatically configure software source code packages
 License:        GPLv2+ and GPLv3+ and GFDL
 URL:            https://www.gnu.org/software/%{name}/
@@ -33,6 +33,13 @@ can use, in the form of M4 macro calls.
 
 %prep
 %autosetup -n %{name}-%{version} -p1
+echo 'main() {}' | g++ -E -v - > g++.log 2>&1
+grep -rn -m 1 COLLECT_GCC_OPTIONS g++.log > option.log
+GCC_OPTION=`cat option.log`
+if [[ $GCC_OPTION != *"fsigned-char"* ]];then
+  sed -i "s|((char) -1) < 0|((unsigned char) -1) < 0|g" lib/autoconf/c.m4
+fi
+rm -rf g++.log option.log
 
 %build
 export EMACS=%{_bindir}/emacs
@@ -72,6 +79,12 @@ fi
 
 
 %changelog
+* Fri May 24 2024 fuanan <fuanan3@h-partners.com> - 2.71-4
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:Adapt signed-char check macro for default unsigned evironment
+
 * Sat Oct 22 2022 yixiangzhike <yixiangzhike007@163.com> - 2.71-3
 - Type:bugfix
 - ID:NA