Search path for patches

[Konrad Hinsen]

Hi everyone,

I have been searching for a while, without much success, so I am trying
to tap into your collective wisdom: What's the search path used by
search-patches?

More precisely, where do I have to put patches
 1. In a channel?
 2. In a directory added to GUIX_PACKAGE_PATH/GUILE_LOAD_PATH?

The main Guix channel has a "patches" directory inside "packages".  The
channel guix-science has it at the root. For my own channel that I am
trying to set up, neither seems to work so far.

Cheers,
  Konrad.