After upgrading weechat using Homebrew, brew says formula built but weechat was not symlinked
Just fixed this same issue on my system!

From this related thread about a similar brew link issue with nmap:


  I'd wiped /usr/local/ before installing brew, so was unsure about this. Realised that MacTeX installs its stuff in there too by default, causing this issue.


Apparently some software will write to that folder using root privileges on install so there is an ownership issue here.

To fix:


ls -la /usr/local/share/man/
Identify which directories require ownership permission changes


Using /usr/local/share/man/de/ as an example, it was owned by user "root" in group "wheel" prior to the fix, whereas we want it to be owned by your user (output of whoami) in group "admin"

Recursively change ownership of the directory and all sub-directories thereof: sudo chown -R $(whoami):admin /usr/local/share/man/de/
Attempt linking again: brew link weechat


The above steps fixed the issue for me!