[tor-relays] libzstd and/or liblzma

Hi everybody

Can somebody please help me understand the change log for 3.1.x: "Support for these algorithms requires that tor is built with the libzstd and/or liblzma libraries available." Is it AND or OR or something whatever different ?

Might ports archivers/zstd only do the job (OR-type):

Tor 0.3.1.2-alpha (git-61625b8f26384a4a) running on FreeBSD with Libevent 2.1.8-stable, OpenSSL LibreSSL 2.5.3, Zlib 1.2.8, Liblzma N/A, and Libzstd 1.2.0