SLAPD_USE_SQL=mysql make sql
[...and then...]
>>>>> ./scripts/sql-test000-read failed (exit 1)
Fantastic! See http://www.openldap.org/faq/data/cache/1089.html
In particular, I'd try
SLAPD_USE_SQL='mysql' SLAPD_DEBUG='-1' make sql
wait for the apparently inevitable "failed", then look at the slapd.1.log
and/or ldapsearch.out and/or anything else that seems relevant.
Take the nastiest sounding messages -- sometimes these are the last few
messages -- and you can report back with them if the resolution isn't
obvious.