I am writing with regard to a recent GCC update for the Ubuntu 15.04 (not sure if other versions received it).
The crypto++9 package in the default repository was compiled with another ABI (1002), which is now outdated due to major GCC update (GCC 5.1.1, ABI 1008). As far as I understand, you are the original maintainer of this package. Could it be possible for you to recompile it in order to suit the latest GCC?