build toolchain in ubuntu

[invent-lwj]

hello everyone!
      I'm a freshman,can i build rtems4.8 toolchain with rpm package in ubuntu.which version should i get fc7 or redhat?
      other question,if i use source code package build,i want to build 4.7.99.2,which version i should download?
                                                      
                                                best regards!     
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