Get current versions of applications via apt-get

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http://unix.stackexchange.com – I am new to debian. What bothers me is that apt-get install shows just really old versions of everything. E. g. "Eclipse Galileo" but currently it's "Juno" and imho there was "Helios" and "Indigo" in between. And gcc is 4.2 but I need at least 4.6 for c++11 features. My question ist how can I get apt-get to show me new versions of the programs? (HowTos)