diff --git a/openresty.spec b/openresty.spec
index cec6233..b9736b4 100644
--- a/openresty.spec
+++ b/openresty.spec
@@ -19,6 +19,7 @@
 %global otel_cpp_builddir                   %{_builddir}/opentelemetry-cpp-%{opentelemetry_cpp_version}
 %global openresty_builddir                  %{_builddir}/openresty-%{commitid}
 %global lib_path                            /opt/app-root/lib
+%global gcc11_path                          /opt/rh/gcc-toolset-11/root/bin

 %if 0%{?fedora} >= 27
 %undefine _debugsource_packages
@@ -29,7 +30,6 @@ Name:           openresty
 Version:        %{version_major}.%{version_minor}.%{version_micro}
 Release:        21%{?dist}
 Summary:        OpenResty, scalable web platform by extending NGINX with Lua
-ExcludeArch:    s390x
 Group:          System Environment/Daemons

 # BSD License (two clause)
@@ -91,6 +91,7 @@ Source49: opentelemetry-proto-%{opentelemetry_proto_version}.tar.gz
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)

 BuildRequires:  perl-File-Temp, dos2unix, pcre-devel, openssl-devel
+BuildRequires:  gcc-toolset-11
 BuildRequires:  gcc, make, perl, systemtap-sdt-devel, git, annobin-annocheck
 BuildRequires:  gcc-c++, cmake
 BuildRequires:  openresty-zlib-devel >= 1.2.11-3
@@ -237,6 +238,24 @@ tar xzfv %{SOURCE45}
 ls -al %{_builddir}
 mkdir -p %{grpc_builddir}/cmake/build
 cd %{grpc_builddir}/cmake/build
+%ifarch s390x
+cmake -DgRPC_INSTALL=ON \
+    -DgRPC_BUILD_TESTS=OFF \
+    -DCMAKE_C_COMPILER=%{gcc11_path}/gcc \
+    -DCMAKE_CXX_COMPILER=%{gcc11_path}/g++ \
+    -DCMAKE_INSTALL_PREFIX=%{otel_install} \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DBUILD_SHARED_LIBS=ON \
+    -DgRPC_BUILD_GRPC_NODE_PLUGIN=OFF \
+    -DgRPC_BUILD_GRPC_OBJECTIVE_C_PLUGIN=OFF \
+    -DgRPC_BUILD_GRPC_PHP_PLUGIN=OFF \
+    -DgRPC_BUILD_GRPC_PHP_PLUGIN=OFF \
+    -DgRPC_BUILD_GRPC_PYTHON_PLUGIN=OFF \
+    -DgRPC_BUILD_GRPC_RUBY_PLUGIN=OFF \
+    -DgRPC_SSL_PROVIDER=package \
+    -DgRPC_ZLIB_PROVIDER=package \
+    ../..
+%endif
 cmake -DgRPC_INSTALL=ON \
     -DgRPC_BUILD_TESTS=OFF \
     -DCMAKE_INSTALL_PREFIX=%{otel_install} \