is it possible to load the gemtools into pharo 2.0 ?

Hi, is it possible to load the gemtools into pharo 2.0 ? When I try this code : " Gofer new squeaksource: 'MetacelloRepository'; package: 'ConfigurationOfGemTools'; load. (Smalltalk at: #ConfigurationOfGemTools) perform: #loadLatestVersion. (Smalltalk at: #GemToolsHelpBrowser) open. " in a workspace I get an error: "Preferences class(Object)>>doesNotUnderstand: #allowUnderscoreAssignmentSetting: " I am looking forward to hearing from you Regards Hugo