So, it might be that your Sybase installation is 32-bit. Normally, perl modules link against libraries provided by the application. In this case, linker searches for these libraries in /apps/sybase/lib, it needs library with name 'ct'. The ones that it finds are not compatible with the object currently created.

So, I would recommend you to check Sybase installation and leave CPAN alone :) You can use 'file' utility to see type of the object.