How to build the perl-Net-DNS

1. cp the Net-DNS-0.80.tar.gz to the rpmbuild/SOURCES/
2. cp the Net-DNS.spec to the rpmbuild/SPECS/
3. cd rpmbuild/SPECS/
4. rpmbuild -bb Net-DNS.spec (The default buildarch in Net-DNS.spec is x86_64, needs to modify buildarch if the build arch is not x86_64)