https://github.com/jordansissel/ruby-arr-pm/blob/master/lib/arr-pm/file.rb#L96
Summary: RPM reader and writer library
Name: ruby-%{pkgname}
Version: 0.0.10
-Release: 1
+Release: 2
License: Apache v2.0
Group: Development/Languages
Source0: http://rubygems.org/downloads/%{pkgname}-%{version}.gem
%if %{with tests}
BuildRequires: ruby-flores
%endif
+Requires: cpio
Requires: ruby-cabin
BuildArch: noarch
BuildRoot: %{tmpdir}/%{name}-%{version}-root-%(id -u -n)