#2955: BDB detection broken Revision 5212 ("Attempt to clean up DB back-end selection") of configure.ac broke BDB detection if --with-bdb=DIR is specified and DIR is not one of the default (hardcoded) directories. The problem is ac_bdb_prefix getting overwritten with `yes' after it's set to $withval by AC_ARG_WITH(). -- Ticket URL: <http://dev.mutt.org/trac/ticket/2955>