When running ANSYS Icepak 12.0 and you get the following error:

/Fluent.Inc/icepak12.0.2/bin.lnx86/icepak: error while loading shared libraries: libg2c.so.0: cannot open shared object file: No such file or directory

that means that a g77 library is missing. For example, on CentOS 5.3, this shared library is part of the “compat-gcc-34-g77” package. On the other hand, on Debian, the package is called “libg2c0”.