Regardless of what I request homebrew to do this error message appears, btw
I run yosemite: not the leopard mentioned:
==> Pouring portable-ruby-2.3.3.leopard_64.bottle.tar.gz
Error: Failed to upgrade vendor ruby.
Error: Failed to install vendor Ruby.
Any help appreciated.
@dan_d, try this:
Somehow my environment had set certificate verification…
I got the same error then problem solved after I ran brew update.