if GNUPGHOME is set, then running gpgconf --change-options spews an unnecessary warning about

dirmgnr_ldapservers.conf

$ echo 'keyserver:16:' | GNUPGHOME=$(pwd) gpgconf --change-options dirmngr
gpgconf: warning: can not open list file /tmp/cdtemp.f23Wzm/dirmngr_ldapservers.conf: No such file or directory
dirmngr:Network:/usr/bin/dirmngr:1:1:

surprisingly, this doesn't happen if --homedir $(pwd) is supplied on the command line, but GNUPGHOME is unset.