diff --git a/webbench.spec b/webbench.spec
index 0adf1c40bf55567227abd8cc4626384f46083706..7a30a9f75d096dd058f47c5de43cb9a331c53c44 100644
--- a/webbench.spec
+++ b/webbench.spec
@@ -2,7 +2,7 @@
 
 Name:    webbench
 Version: 1.5
-Release: 3
+Release: 4
 Summary: simple tool for benchmarking WWW or proxy servers
 License: GPL-1.0-or-later
 URL:	 http://home.tiscali.cz/~cz210552/webbench.html
@@ -23,6 +23,8 @@ Web Bench is very simple tool for benchmarking WWW or proxy servers. Uses fork()
 %patch1 -p1
 
 %build
+ADDITIONAL=' -ggdb -W -I/usr/include/tirpc'
+CFLAGS+=$ADDITIONAL
 %make_build
 
 %install
@@ -42,6 +44,9 @@ Web Bench is very simple tool for benchmarking WWW or proxy servers. Uses fork()
 %{_mandir}/*
 
 %changelog
+* Mon Aug 28 2023 Ge Wang <wang__ge@126.com> - 1.5-4
+- Fix build error, add include directory
+
 * Mon Jul 18 2022 wangkai <wangkai385@h-partners.com> - 1.5-3
 - License compliance rectification