Install issue - "You don't have write permissions"

[fsafq41]

When trying to install on a mac apple silicon with a default ruby i obtain the following error message:

gem install weblink ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /Library/Ruby/Gems/2.6.0 directory.

Any reason, why weblink (and related packages) tries to install directly into the ruby directory? Note: i tried a sudo install (not recommended at all, of course) and got other errors also...