On Mon, 2014-03-03 at 02:09 +0000, stenn@ntp.org wrote:

openldap-thread-check.m4 seems to hand-code an equivalent of AC_ARG_WITH() processing for the with_yielding_select stuff. This code has at least one typo and at least one bug; it does not work in the case where one is cross-compiling.

OpenLDAP has no openldap-thread-check.m4. Maybe you're referring to some other package which checks how OpenLDAP uses threads. It could be doing something to match how OpenLDAP handles threads.