!7 Completing build dependencies

From: @hht8
Reviewed-by: @zhengzhenyu
Signed-off-by: @zhengzhenyu

protobuf2.spec

@@ -6,7 +6,7 @@
 Summary:             Protocol Buffers - Google's data interchange format
 Name:                protobuf2
 Version:             2.5.0
-Release:             1
+Release:             2
 License:             BSD
 Source:              http://protobuf.googlecode.com/files/protobuf-%{version}.tar.bz2
 Source1:             ftdetect-proto.vim
@@ -16,7 +16,7 @@ Patch2:              protobuf-2.5.0-java-fixes.patch
 Patch3:              0001-Add-generic-GCC-support-for-atomic-operations.patch
 Patch4:              protobuf-2.5.0-makefile.patch
 URL:                 http://code.google.com/p/protobuf/
-BuildRequires:       automake autoconf libtool pkgconfig zlib-devel emacs emacs-el >= 24.1 maven-plugin-bundle
+BuildRequires:       automake autoconf libtool pkgconfig zlib-devel emacs emacs-el >= 24.1 maven-plugin-bundle gcc-c++
 %if %{with gtest}
 BuildRequires:       gtest-devel
 %endif
@@ -241,5 +241,8 @@ install -p -m 0644 %{SOURCE2} $RPM_BUILD_ROOT%{emacs_startdir}
 %endif
 
 %changelog
+* Mon May 31 2021 huanghaitao <huanghaitao8@huawei.com> - 2.5.0-2
+- Completing build dependencies
+
 * Fri Feb 26 2021 Ge Wang <wangge20@huawei.com> - 2.5.0-1
 - Package init