libstdc++.so.6: version `GLIBCXX_3.4.9' not found

["Mathieu Malaterre" <mathieu.malaterre@gmail.com>]

Hi,

  I am trying to figure out how to compile a program using an older
GLIBC / GLIBCXX API so that I can send the compiled program to someone
using an older gcc version. This seems like a trivial problem, but I
cannot find any tutoral on what flags to turn on/off on google...

Thanks!
-- 
Mathieu