Hi Matthew, I experienced a same issue with a mariadb build and I was able to find root of the issue and submitted the patch to the guix-patches maillist.
Looks like everybody who updated guix between 2018-11-23 and 2018-12-31 was able to compile mariadb successfully :-) If you want to work without a custom GUIX_PACKAGE_PATH you can take the patch from the https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34351 and apply it to your cloned guix repository with "git am" command. Then run "guix pull --commit=$(git rev-parse HEAD) --url=$PWD" to use the guix from your local commit. Regards, Nikolai
