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GCC 4.9 hasn't yet been released (and won't be until after Easter). Currently there's only a release candidate. See http://permalink.gmane.org/gmane.comp.gcc.devel/135470

Interesting the main page http://gcc.gnu.org/ lists 4.9 as the current release as opposed to Development release.

If you follow the 4.9 link, you get to http://gcc.gnu.org/gcc-4.9/ which states:

> As of this time no releases of GCC 4.9 have yet been made.