diff --git a/haproxy.spec b/haproxy.spec
index cc801eb55a4249ded682e6a3a7cf9888ec3add30..22a82e73cfc180842194bab69ade0fa0a58819c6 100644
--- a/haproxy.spec
+++ b/haproxy.spec
@@ -5,7 +5,7 @@
 
 Name:             haproxy
 Version:          2.6.6
-Release:          4
+Release:          5
 Summary:          The Reliable, High Performance TCP/HTTP Load Balancer
 
 License:          GPLv2+
@@ -34,15 +34,18 @@ web sites and powers quite a number of the world's most visited ones.
 %prep
 %autosetup -n %{name}-%{version} -p1
 %build
+%if "%toolchain" == "clang"
+	%global make_opts HOSTCC=clang CC=clang CXX=clang++
+%endif
 
-%make_build CPU="generic" TARGET="linux-glibc" USE_OPENSSL=1 USE_PCRE2=1 USE_SLZ=1 \
+%make_build %{?make_opts} CPU="generic" TARGET="linux-glibc" USE_OPENSSL=1 USE_PCRE2=1 USE_SLZ=1 \
     USE_LUA=1 USE_CRYPT_H=1 USE_SYSTEMD=1 USE_LINUX_TPROXY=1 USE_GETADDRINFO=1 USE_PROMEX=1 DEFINE=-DMAX_SESS_STKCTR=12 \
     ADDINC="%{build_cflags}" ADDLIB="%{build_ldflags}"
 
-%make_build admin/halog/halog ADDINC="%{build_cflags}" ADDLIB="%{build_ldflags}"
+%make_build %{?make_opts} admin/halog/halog ADDINC="%{build_cflags}" ADDLIB="%{build_ldflags}"
 
 pushd admin/iprange
-%make_build OPTIMIZE="%{build_cflags}" LDFLAGS="%{build_ldflags}"
+%make_build %{?make_opts} OPTIMIZE="%{build_cflags}" LDFLAGS="%{build_ldflags}"
 popd
 
 %install
@@ -121,6 +124,9 @@ exit 0
 %{_mandir}/man1/*
 
 %changelog
+* Fri Sep 22 2023 yoo <sunyuechi@iscas.ac.cn> - 2.6.6-5
+- support clang build
+
 * Mon Aug 21 2023 wangkai <wang_kai001@hoperun.com> - 2.6.6-4
 - Fix CVE-2023-40225