DOC: update openblas fork warning with fixed pthread build info

site.cfg.example

@@ -86,13 +86,17 @@
 # **Warning**: OpenBLAS, by default, is built in multithreaded mode. Due to the
 # way Python's multiprocessing is implemented, a multithreaded OpenBLAS can
 # cause programs using both to hang as soon as a worker process is forked on
-# POSIX systems (Linux, Mac). Python 3.4 will introduce a new feature in
-# multiprocessing, called the "forkserver", which solves this problem. For
-# older versions, either compile OpenBLAS with multithreading turned off or
-# use Python threads instead of multiprocessing.
+# POSIX systems (Linux, Mac).
+# This is fixed in Openblas 0.2.9 for the pthread build, the OpenMP build using
+# GNU openmp is as of gcc-4.9 not fixed yet.
+# Python 3.4 will introduce a new feature in multiprocessing, called the
+# "forkserver", which solves this problem. For older versions, make sure
+# OpenBLAS is built using pthreads or use Python threads instead of
+# multiprocessing.
 # (This problem does not exist with multithreaded ATLAS.)
 #
 # http://docs.python.org/3.4/library/multiprocessing.html#contexts-and-start-methods
+# https://github.com/xianyi/OpenBLAS/issues/294
 #
 # [openblas]
 # libraries = openblas