diff --git a/oj-3.12.0.gem b/oj-3.12.0.gem
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diff --git a/rubygem-oj.spec b/rubygem-oj.spec
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+# gem_name macro is needed since it is used in Makefile whose is packaged in gemfile
+%global gem_name oj
+
+Name: 		rubygem-oj
+Version: 	3.12.0
+Release: 	1
+Summary: 	A fast JSON parser and serializer.
+Group: 		Development/Languages
+License: 	MIT
+URL: 		http://www.ohler.com/oj
+Source0: 	https://rubygems.org/gems/oj-3.12.0.gem
+
+Requires: ruby(release)
+Requires: ruby >= 2.4
+Requires: ruby(rubygems)
+Requires: rubygem(bigdecimal)
+BuildRequires: ruby(release)
+BuildRequires: ruby-devel >= 2.4
+BuildRequires: rubygems-devel
+BuildRequires: rubygem(bigdecimal)
+Provides: rubygem(oj) = %{version}
+
+%description
+The fastest JSON parser and object serializer.
+
+%package help
+Summary: Documentation for rubygem-oj
+Group: Documentation
+Requires: rubygem(oj) = %{version}-%{release}
+
+%description help
+Documentation for rubygem-oj.
+
+%prep
+gem unpack %{SOURCE0}
+
+%setup -q -D -T -n  oj-%{version}
+
+gem spec %{SOURCE0} -l --ruby > oj.gemspec
+
+%build
+gem build oj.gemspec
+%gem_install
+
+%install
+mkdir -p %{buildroot}%{gem_dir}
+cp -a .%{gem_dir}/* %{buildroot}%{gem_dir}/
+
+mkdir -p %{buildroot}%{gem_extdir_mri}
+cp -a .%{gem_extdir_mri}/{gem.build_complete,oj/*.so} %{buildroot}%{gem_extdir_mri}
+cp -a .%{gem_extdir_mri}/{gem.build_complete,oj/*.so} %{buildroot}%{gem_dir}/gems/oj-%{version}/lib/oj
+
+%check
+mkdir gem_ext_test
+cp -a %{buildroot}%{gem_dir} gem_ext_test/
+mkdir -p gem_ext_test/gems/extensions/%{_arch}-%{_target_os}/$(ruby -r rbconfig -e 'print RbConfig::CONFIG["ruby_version"]')/
+cp -a %{buildroot}%{gem_extdir_mri} gem_ext_test/gems/extensions/%{_arch}-%{_target_os}/$(ruby -r rbconfig -e 'print RbConfig::CONFIG["ruby_version"]')/
+GEM_PATH="./gem_ext_test/gems:$GEM_PATH" ruby -e "require 'oj'"
+rm -rf gem_ext_test
+
+%files
+%dir %{gem_instdir}
+%exclude %{gem_instdir}/test
+%{gem_instdir}/ext
+%{gem_extdir_mri}
+%license %{gem_instdir}/LICENSE
+%{gem_libdir}
+%exclude %{gem_cache}
+%{gem_spec}
+
+%files help
+%doc %{gem_instdir}/pages
+%doc %{gem_docdir}/
+%doc %{gem_instdir}/README.md
+
+%changelog
+* Tue Jul 27 2021 Chenghong Li <lichenghong@kylinos.cn> - 3.12.0-1
+- Initial package
+