fix build

rubygem-iconv.spec

@@ -35,11 +35,16 @@ Documentation for %{name}.
 
 %install
 mkdir -p %{buildroot}%{gem_dir}
-mkdir -p %{buildroot}%{gem_extdir_mri}/lib/%{gem_name}
+mkdir -p %{buildroot}%{gem_extdir_mri}
 cp -a .%{gem_dir}/* \
         %{buildroot}%{gem_dir}/
 
-mv %{buildroot}%{gem_libdir}/%{gem_name}/*.so %{buildroot}%{gem_extdir_mri}/lib/%{gem_name}
+if [ -d .%{gem_extdir_mri}/%{gem_name} ]; then
+  mv .%{gem_extdir_mri}/%{gem_name}/*.so %{buildroot}%{gem_extdir_mri}/%{gem_name}
+else
+  mkdir -p %{buildroot}%{gem_extdir_mri}/lib/%{gem_name}
+  mv %{buildroot}%{gem_libdir}/%{gem_name}/*.so %{buildroot}%{gem_extdir_mri}/lib/%{gem_name}
+fi
 
 # Remove the binary extension sources and build leftovers.
 rm -rf %{buildroot}%{gem_instdir}/ext