/usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found

I'm compiling gcc 4.6 from source, and apparently

sudo make install 

didn't catch this one. I dug around and found

gcc/trunk/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6.0.15

I copied it in to /usr/lib and redirected libstdc++.so.6 to point to the new one, and now everything works.

I have been avoiding this issue in the past by simply linking libstdc++ statically with this parameter sent to g++ when linking my executable:

-static-libstdc++

If linking in the library statically is an option this is probably the quickest work-around.