Change agent-socket path

[Wolf]

Greetings,
I'm in need of changing the path to the agent socket, but I cannot find
a way to do so. My problem:

gpg-agent normally runs in /run/user/1000/gnupg/S.gnu-agent , which is
completely fine. However, when building packages (archlinux, makepkg),
the building/signing is done in fakeroot environment. Therefore the
socket path default to ~/.gnupg/S.gnu-agent. Because (at least it seems
to me) in fakeroot I am root (0) and therefore don't own /run/user/1000
(1000).

What would be a good way to solve this issue?

Thanks for any help,
W.
-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.
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