diff --git a/rubygem-diff-lcs.spec b/rubygem-diff-lcs.spec
index 3ca9146..704bef5 100644
--- a/rubygem-diff-lcs.spec
+++ b/rubygem-diff-lcs.spec
@@ -1,20 +1,22 @@
-%global ruby_sitelib %(ruby -rrbconfig -e "puts Config::CONFIG['sitelibdir']")
-%global gemdir %(ruby -rubygems -e 'puts Gem::dir' 2>/dev/null)
+%global gemdir %{gem_dir}
 %global gemname diff-lcs
-%global geminstdir %{gemdir}/gems/%{gemname}-%{version}
+%global	gem_name %{gemname}
+%global geminstdir %{gem_instdir}
+
+%global	rubyabi	1.9.1
 
 Summary:        Provide a list of changes between two sequenced collections
 Name:           rubygem-%{gemname}
 Version:        1.1.2
-Release:        6%{?dist}
+Release:        7%{?dist}
 Group:          Development/Languages
 License:        GPLv2+ or Ruby or Artistic
 URL:            http://rubyforge.org/projects/ruwiki/
 Source0:        http://gems.rubyforge.org/gems/%{gemname}-%{version}.gem
-BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
-Requires:       ruby(abi) = 1.8
+Requires:       ruby(abi) = %{rubyabi}
 Requires:       rubygems
-BuildRequires:  rubygems
+BuildRequires:  rubygems-devel
+BuildRequires:	ruby(abi) = %{rubyabi}
 BuildArch:      noarch
 Provides:       rubygem(%{gemname}) = %{version}
 
@@ -25,19 +27,32 @@ two sequenced enumerable containers. The implementation is based on Mario I.
 Wolczko's Smalltalk version (1.2, 1993) and Ned Konz's Perl version
 (Algorithm::Diff).
 
+%package	doc
+Summary:	Documentation for %{name}
+Group:		Documentation
+
+Requires:	%{name} = %{version}-%{release}
+
+%description	doc
+This package contains documentation for %{name}.
 
 %prep
+%setup -q -c  -T
+mkdir -p .%{gemdir}
+gem install --local --install-dir .%{gemdir} \
+	-V \
+        --force --rdoc %{SOURCE0}
 
 
 %build
 
 
 %install
-rm -rf $RPM_BUILD_ROOT
 mkdir -p $RPM_BUILD_ROOT%{gemdir}
-gem install --local --install-dir $RPM_BUILD_ROOT%{gemdir} \
-        --force --rdoc %{SOURCE0}
 mkdir -p $RPM_BUILD_ROOT/%{_bindir}
+
+cp -a .%{gemdir}/* $RPM_BUILD_ROOT%{gemdir}
+
 mv $RPM_BUILD_ROOT%{gemdir}/bin/* $RPM_BUILD_ROOT/%{_bindir}
 rmdir $RPM_BUILD_ROOT%{gemdir}/bin
 find $RPM_BUILD_ROOT%{geminstdir}/bin -type f |xargs chmod a+x
@@ -52,29 +67,31 @@ do
         mv chopped $F
 done
 
-
-%clean
-rm -rf $RPM_BUILD_ROOT
-
+%check
+pushd .%{geminstdir}
+ruby -Ilib tests/*.rb
 
 %files
-%defattr(-,root,root,-)
 %{_bindir}/ldiff
 %{_bindir}/htmldiff
 %dir %{geminstdir}
-%{geminstdir}/Rakefile
 %{geminstdir}/bin
 %{geminstdir}/lib
-%doc %{geminstdir}/tests
-%doc %{gemdir}/doc/%{gemname}-%{version}
-%doc %{geminstdir}/README
-%doc %{geminstdir}/ChangeLog
-%doc %{geminstdir}/Install
+%{geminstdir}/[A-Z]*
+%exclude %{geminstdir}/Rakefile
 %{gemdir}/cache/%{gemname}-%{version}.gem
 %{gemdir}/specifications/%{gemname}-%{version}.gemspec
 
+%files doc
+%{geminstdir}/Rakefile
+%{geminstdir}/tests/
+%{gemdir}/doc/%{gemname}-%{version}
+
 
 %changelog
+* Sun Jan 22 2012 Mamoru Tasaka <mtasaka@fedoraproject.org> - 1.1.2-7
+- Rebuild against ruby 1.9
+
 * Sat Jan 14 2012 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 1.1.2-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_17_Mass_Rebuild