debian m64 libstdc -> Debian -- Details of package libstdc++6 in sid -> http://packages.debian.org/lib64stdc++6 -> Debian -- Details of package lib64stdc++6 in sid

So try apt-get install lib64stdc++6
then  g++ -m64 ought to work

In reply to Re: [OT] Installing g++ compiler on ubuntu-12.04LTS ( apt-get install lib64stdc++6 ) by Anonymous Monk
in thread [OT] Installing g++ compiler on ubuntu-12.04LTS by syphilis

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