I had the same problem at the end of December
look at
http://lists.wfu.edu/pipermail/gretl-users/2015-December/011464.html
and other messages from the same thread
Oleh

18 січня 2016, 19:37:14, від "Artur T." <artur.tarassow@googlemail.com>:

Dear Jack and Allin,

this morning I've got the following note when opening latest cvs gretl 
on my ubuntu machine.

"gretl is built using OpenMP, but is linked against
OpenBLAS parallelized via pthreads. This combination
of threading mechanisms is not recommended. Ideally,
OpenBLAS should also use OpenMP."

Honestly, I am not sure what's the best to do now.

Best,
Artur
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