What is Guix garbage collector root aka gc root

[Oleg Pykhalov]

Hello Guix,

I'm trying to understand what is “garbage collector root” aka “gc root”.

1. Is “$HOME/.guix-profile” a “gc root”?

2. I need to build a package, but don't install it.  Just preserve it
for offloading.  Is “guix build --root=$HOME/.guix-profile PACKAGE” (run
as non root user) what I want?  Or if not, what FILE in “--root=FILE” do
I need to pass?

Thanks.

-- 
Best regards,

Oleg.