+ ct_xz,
+ ct_zstd
there should be a comma after ct_zstd. compilers can accept this now.
You are missing concatenation -A support. Zstd has special compatibility with
concatenation
(read the man page)
and as such you should change the tar man page to document that -A works with
zstd, and make
sure -A works with .tar.zstd archives.
-Shawn Landden
