diff --git a/ntp.spec b/ntp.spec
index 89504fde7162fdd75019e2ee780c5e615576583f..a6db5ccce27dd2a37f4f4a4119019377f33b12c5 100644
--- a/ntp.spec
+++ b/ntp.spec
@@ -2,7 +2,7 @@
 
 Name:                  ntp
 Version:               4.2.8p17
-Release:               3
+Release:               4
 Summary:               A protocol designed to synchronize the clocks of computers over a network
 License:               MIT and BSD and BSD with advertising
 URL:                   https://www.ntp.org/
@@ -68,6 +68,9 @@ done
 %build
 sed -i 's|$CFLAGS -Wstrict-overflow|$CFLAGS|' configure sntp/configure
 export CFLAGS="$RPM_OPT_FLAGS -fno-strict-aliasing -fno-strict-overflow"
+%if "%{?toolchain}" == "clang"
+    CFLAGS="${CFLAGS:-%{?build_cflags}} $CFLAGS -Wno-error=int-conversion"; export CFLAGS;
+%endif
 %configure \
         --sysconfdir=%{_sysconfdir}/ntp/crypto --with-locfile=redhat \
         --without-ntpsnmpd --enable-all-clocks --enable-parse-clocks \
@@ -208,6 +211,12 @@ make check
 %{_mandir}/man8/*.8*
 
 %changelog
+* Thu Feb 22 2024 luofng <luofeng13@huawei.com> - 4.2.8p17-4
+- Type: enhencement
+- CVE:NA
+- SUG:NA
+- DESC:support for building with clang
+
 * Tue Jan 23 2024 chengyechun <chengyehcun1@huawei.com> - 4.2.8p17-3
 - Type:bugfix
 - ID:NA