bin/autoproj_bootstrap in autoproj-1.9.2 vs bin/autoproj_bootstrap in autoproj-1.9.3.rc1

@@ -519,10 +519,16 @@
                         end
 
                     if !installed.empty? && Autobuild.do_update
                         # Look if we can update the package ...
                         dep = Gem::Dependency.new(name, version_requirements)
-                        available = gem_fetcher.find_matching(dep, true, true, GemManager.with_prerelease)
+                        available =
+                            if gem_fetcher.respond_to?(:find_matching)
+                                gem_fetcher.find_matching(dep, true, true, GemManager.with_prerelease)
+                            else
+                                dep.prerelease = GemManager.with_prerelease
+                                gem_fetcher.search_for_dependency(dep).first
+                            end
                         installed_version = installed.map(&:version).max
                         available_version = available.map { |(name, v), source| v }.max
                         if !available_version
                             if version
                                 raise ConfigError.new, "cannot find any gem with the name '#{name}' and version #{version}"