--- configure.orig	2014-07-14 07:30:12 UTC
+++ configure
@@ -16277,7 +16277,7 @@
              # thread: pthread_create from libc will fail, whereas
              # pthread_create will actually create a thread.
              case "$host_os" in
-               solaris* | hpux*)
+               solaris* | hpux* | freebsd*)
 
 $as_echo "#define PTHREAD_IN_USE_DETECTION_HARD 1" >>confdefs.h