#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().
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Ticket URL: <http://dev.mutt.org/trac/ticket/2955>