build toolchain in ubuntu

[Ray]

>>
>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?
Both should work. Use tools like rpmunpack to extract the tool-chain to your PATH
>      other question,if i use source code package build,i want to build 4.7.99.2,which version i should download?
Any version from 4.8 trunk
>
>                                                best regards!
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