pkg 1.6.1 doesn compile

[Luciano Mannucci]

Hello,

I'm trying to compile pkg from the ports on a 9.3 ppc system.
LD complains about an undefined reference to archive_read_support_filter_all
in pkg.c and a lot of other undefined references in packing.c, pkg_audit.c
and pkg_repo.c (archive_write_add_filter_xz, the same ending in _gzip,
_none, _bzip2, pkg_audit_sandboxed_exrtract, 
pkg_repo_meta_extract_signature_fingerprints, ...)
It looks like missing libraries, but wich ones?

Thanks to all,

Luciano.
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