The wheezy version of libunwind is only built for i386, amd64 and ia64.
The packages you are seeing on the repository server are jessie packages and you should find they are listed in the jessie packages files.
The wheezy version of libunwind is only built for i386, amd64 and ia64.
The packages you are seeing on the repository server are jessie packages and you should find they are listed in the jessie packages files.