FYI: It is still reproducible on unstable with: * varnish 6.5.2-1 * autoconf 2.71-2
It seems that autoreconf generates broken configure. (without autoreconf, ./configure just works) I'm not sure but in source tree, m4/ax_pthread.m4 around AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], causes the issue. Regards,
