--- Source/ThirdParty/gtest/m4/acx_pthread.m4.orig	2020-09-24 00:32:17.000000000 +1000
+++ Source/ThirdParty/gtest/m4/acx_pthread.m4	2020-09-24 01:21:13.941141000 +1000
@@ -219,7 +219,7 @@
         AC_MSG_CHECKING([if more special flags are required for pthreads])
         flag=no
         case "${host_cpu}-${host_os}" in
-            *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
+            *-bsdsunix* | *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
             *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
         esac
         AC_MSG_RESULT(${flag})