There's something wrong with package gambas-examples in the repositories which causes a full gambas install to fail on FC4. The following command, recommended by gambas peeps themselves, doesn't work for me:
yum install gambas*
As far as I can tell the examples shouldn't be version specific, at least not minor version specific (can't rule out a major interpreter change might break something), so hoping someone just forgot to update a dependency list somewhere, or something like that.
Anyway, for anyone interested in Visual Basic on steroids and on the Linux platform (and not just a clone, as authors keep reminding us), the command that'll get everything up and running (for now) is:
yum --exclude=gambas-examples install gambas*