diff --git a/mozjs91.spec b/mozjs91.spec
index 10f075a22d1a7257bc294d96bc4811079930f3b7..2d03d57a2a34350a21554466a62415b077a7f8f2 100644
--- a/mozjs91.spec
+++ b/mozjs91.spec
@@ -1,7 +1,11 @@
 %define _lto_cflags %{nil}
 
 # upstream default is clang (to use gcc for large parts set to 0)
+%if "%toolchain" == "clang"
+%define clang_build 1
+%else
 %define clang_build 0
+%endif
 
 %global major 91
 # LTO - Enable in Release builds, but consider disabling for development as it increases compile time
@@ -12,7 +16,7 @@
 # Big endian platforms
 Name:           mozjs%{major}
 Version:        91.6.0
-Release:        3
+Release:        4
 Summary:        SpiderMonkey JavaScript library
 License:        MPL-2.0
 Group:          System/Libraries
@@ -130,7 +134,7 @@ case `uname -i` in
   i386 | sparc )
     wordsize="32"
     ;;
-  x86_64 | sparc64 )
+  x86_64 | sparc64 | aarch64)
     wordsize="64"
     ;;
   *)
@@ -207,6 +211,9 @@ popd
 %{_includedir}/mozjs-%{major}/
 
 %changelog
+* Mon Sep 18 2023 zhoujing <zhoujing106@huawei.com> - 91.6.0-4
+- Support for building with clang
+
 * Thu Dec 15 2022 liuyu <liuyu@loongson.cn> - 91.6.0-3
 - support loongarch64 in spidermonkey