try fix build issues

rubygem-abstract_method.spec

@@ -1,20 +1,5 @@
-#
-# spec file for package rubygem-abstract_method
-#
-# Copyright (c) 2014 SUSE LINUX Products 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/
-#
-
+# originally from openSUSE, modified for integration with openEuelr package architecture
+%global gem_name abstract_method
 Name:           rubygem-abstract_method
 Version:        1.2.1
 Release:        0
@@ -35,14 +20,24 @@ Abstract Method is a tiny library enabling you to define abstract methods in
 Ruby classes and modules.
 
 %prep
+%setup -q -n %{gem_name}-%{version} -b 1
 
 %build
-
+gem build ../%{gem_name}-%{version}.gemspec
+%gem_install
 %install
-%gem_install \
-  --doc-files="LICENSE README.md" \
-  -f
+mkdir -p %{buildroot}%{gem_dir}
+cp -a .%{gem_dir}/* \
+        %{buildroot}%{gem_dir}/
+%files
+%dir %{gem_instdir}
+%license %{gem_instdir}/MIT-LICENSE
+%{gem_libdir}
+%exclude %{gem_cache}
+%{gem_spec}
 
-%gem_packages
+%files doc
+%doc %{gem_docdir}
+%doc %{gem_instdir}/README.md
 
 %changelog