When running ANSYS Icepak 12.0, ANSYS Polyflow 3.12, or Airpak 3.0 and you get the following error message:

/Fluent.Inc/icepak12.0.2/bin.lnx86/icepak: error while loading shared libraries: libstdc++.so.5: cannot open shared object file: No such file or directory

this means that the older C++ library (associated with GCC version 3) is not present. For example, on CentOS 5.3, install the “compat-libstdc++-33” package whereas on Debian, the package is called “libstdc++5”.