I am installing my project Ephestos on Pharo 5 that depends on SmaCC and SmaCC gives me the following warning

This package depends on the following classes: StringHolder You must resolve these dependencies before you will be able to load these definitions: SmaCCCodeHolder SmaCCCodeHolder>>#owner: SmaCCCodeHolder>>#owner:ownerAcceptSelector: SmaCCCodeHolder>>#contents:notifying: SmaCCCodeHolder>>#contentsMenu:shifted: SmaCCCodeHolder>>#contentsMorph SmaCCCodeHolder>>#hasUnacceptedEdits SmaCCCodeHolder>>#okToChange SmaCCCodeHolder>>#owner SmaCCCodeHolder>>#owner: SmaCCCodeHolder>>#owner:ownerAcceptSelector: SmaCCCodeHolder>>#ownerAcceptSelector SmaCCCodeHolder>>#ownerAcceptSelector: SmaCCCodeHolder>>#perform:orSendTo: SmaCCCodeHolder>>#readContentsFromFile SmaCCCodeHolder>>#saveContentsInFile Select Proceed to continue, or close this window to cancel the operation.