Description:
The static library of libtar is not compiled with relocation support on x86_64 (-fPIC). Thus it is not possible to "link" it into a shared library.

Additional info:
* version 1.2.11-1

Steps to reproduce:
Try to create a shared library which uses and links libtar:
$ gcc -shared foo.o -ltar

For instance:
$ echo "void foo (void) { tar_open (0, 0, 0, 0, 0, 0); }" > foo.c
$ gcc -c foo.c -o foo.o -fPIC
$ gcc -shared foo.o -ltar -o foo.so