autoproj_bootstrap in autoproj-1.7.14.rc2

- old
+ new
@@ -685,11 +685,15 @@
             # Don't install gems that are already there ...
             gems = gems.dup
             gems.delete_if do |name, version|
                 version_requirements = Gem::Requirement.new(version || '>= 0')
                 installed =
-                    if Gem.source_index.respond_to?(:find_by_name)
-                        Gem.source_index.find_by_name(name, version_requirements)
+                    if Gem::Specification.respond_to?(:find_by_name)
+                        begin
+                            [Gem::Specification.find_by_name(name, version_requirements)]
+                        rescue Gem::LoadError
+                            []
+                        end
                     else
                         Gem.source_index.find_name(name, version_requirements)
                     end
                 if !installed.empty? && Autobuild.do_update
                     # Look if we can update the package ...