9.9 has threads disabled by default *-linux*) # Threads are disabled on Linux by default because most # Linux kernels produce unusable core dumps from multithreaded # programs, and because of limitations in setuid(). use_threads=false ;; 9.10 enables threads by default *-linux*) use_threads=true ;; Note threads are not explictly enabled in either build. In message , "David Lawless via RT" writes: > Mar 18 22:47:14.579 5 named[]: starting BIND 9.10.4b2 -c /usr/local/etc/named.conf -n 2 > Mar 18 22:47:14.579 5 named[]: running on Linux x86_64 2.6.32.67 #1 SMP Sat Aug 29 13:24:08 EDT 2015 > Mar 18 22:47:14.579 5 named[]: built with '--enable-full-report' '--with-openssl=/usr/local/openssl-1.0.2' '--with-libxml2=no' 'LDFLAGS=-L > /usr/local/lib64' > Apr 10 19:04:45.058 5 named[]: starting BIND 9.9.9b2 (Extended Support Version) -c /usr/local/etc/named.conf -n 2 -4 -S 8192 > -u named > Apr 10 19:04:45.058 5 named[]: running on Linux x86_64 2.6.32.67 #1 SMP Sat Aug 29 13:24:08 EDT 2015 > Apr 10 19:04:45.058 5 named[]: built with '--enable-full-report' '--with-openssl=/usr/local/openssl-1.0.2' '--with-libxml2=no' '--sysconfd > ir=/usr/local/etc' 'LDFLAGS=-L/usr/local/lib64' -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org