Bundled libarchive (which is used by pkg) doesn't have zstd built-in?

[Autumn Jolitz]

I tried to create a `tzst` format pkg but it failed with: "pkg: zstd is supported, but not builtin."

This is on a 6.5 system running latest master and pkg 2.2.0.

This could be a problem as `tzst` is the default pkg format (https://lists.freebsd.org/archives/freebsd-ports/2025-January/007185.html) — a bare `pkg create …` will complain about zstd despite /usr/local/etc/pkg.conf having all defaults.

Since pkg farms out archive unpacking to libarchive:

$ ldd /usr/local/sbin/pkg | grep libarchive
        libarchive.so.5 => /usr/lib/libarchive.so.5 (0x800bda000)

Taking a look at ``/usr/src/contrib/libarchive/README.DRAGONFLY``, I notice it has

    Configured with
    ===============
    ./configure --without-nettle --with-openssl --without-xml2 --without-zstd \
                --without-lz4 --without-lzo2 \
                ac_cv_lib_md_MD5Init=no ac_cv_lzma_has_mt=no

Hm, yeah that would do it. If we’re using pkg 2.0.2+, the bundled libarchive will likely need to have zstd support added if pkg will be able to make use of tzst.

I notice this cause I build binary packages locally using pkg create and pkg repo. 

`pkg repo` certainly isn’t working with missing zstd support and doesn’t seem to respect pkg.conf ``COMPRESSION_FORMAT = txz`` at all. 😕

Autumn