The change is required to support implementation of pthreads in the Linux
compile of Midas. This was added recently. I believe pthreads is also needed
for ROOT based compiles.
> It appears that all midas applications are now required to link with the
> pthreads library even if they do not use threads. This is caused by a
> pthread_create() call from ss_thread_create() in system.c.
> Is this the intended behaviour?