The Gallery addon for pier first requires that Rio be installed. http://www.squeaksource.com/@7zePIlRlfoA0dT1I/VwzOlsoy However, rio won't install due to errors: FileMacOSXExectuive class as yet unclassified getenv: getenv: varString " self getenv: 'HOME' " " self getenv: 'ZYZZYX' " <> expected ->cdecl: char* 'getenv' ( char* ) module: 'libc.dylib'> ^self externalCallFailed Not sure how to fix this... Using the Seaside-3.0rc one-click for Pharo-Seaside Lawson