--- configure.orig	2021-02-19 02:35:17.000000000 +1000
+++ configure	2021-12-29 10:09:11.642380000 +1000
@@ -6342,6 +6342,14 @@
 
 case $host_os in
 
+        bsdsunix*)
+
+        # -kthread: BSDSUniX kernel threads (preferred to -pthread since SMP-able)
+        # lthread: LinuxThreads port on BSDSUniX (also preferred to -pthread)
+
+        ax_pthread_flags="-kthread lthread $ax_pthread_flags"
+        ;;
+
         freebsd*)
 
         # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)