try fix build issues

rubygem-cfa_grub2.spec

@@ -1,20 +1,4 @@
-#
-# spec file for package rubygem-cfa_grub2
-#
-# Copyright (c) 2019 SUSE LINUX GmbH, Nuernberg, Germany.
-#
-# All modifications and additions to the file contributed by third parties
-# remain the property of their copyright owners, unless otherwise agreed
-# upon. The license for this file, and modifications and additions to the
-# file, is the same license as for the pristine package itself (unless the
-# license for the pristine package is not an Open Source License, in which
-# case the license is the MIT License). An "Open Source License" is a
-# license that conforms to the Open Source Definition (Version 1.9)
-# published by the Open Source Initiative.
-
-# Please submit bugfixes or comments via http://bugs.opensuse.org/
-#
-
+%global gem_name cfa_grub2
 
 Name:           rubygem-cfa_grub2
 Version:        2.0.0
@@ -22,9 +6,7 @@ Release:        0
 %define mod_name cfa_grub2
 %define mod_full_name %{mod_name}-%{version}
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
-BuildRequires:  rubygem-gem2rpm
-BuildRequires:  ruby
-BuildRequires:  ruby-macros >= 5
+BuildRequires:  ruby(release) rubygems-devel rubygems(rspec) >= 3 rubygem(did_you_mean)
 Url:            https://github.com/config-files-api/config_files_api_grub2
 Source:         https://rubygems.org/gems/%{mod_full_name}.gem
 Summary:        Models for GRUB2 configuration files
@@ -36,13 +18,18 @@ Models allowing easy read and modification of GRUB2 configuration files. It is
 a plugin for cfa framework.
 
 %prep
-
+%autosetup -n %{mod_full_name} -p1
+gem unpack %{SOURCE0}
 %build
+gem build ../%{mod_full_name}.gemspec
 
 %install
 %gem_install \
-  -f
-
-%gem_packages
-
+%files
+%dir %{gem_instdir}
+%{gem_libdir}
+%{_datadir}/gems/doc/%{mod_full_name}/
+%{_datadir}/gems/gems/%{mod_full_name}/
+%exclude %{gem_cache}
+%{gem_spec}
 %changelog